Athlete profile

Mateo Rivera

14 years old · Baseball, pitcher, shortstop · 5 ft 7 in169.7 cm · 129 lbs58.5 kg

Mateo is getting stronger, and jump height dipped

5 visits since May Latest
Better

Mid-thigh pull force, up 17% since June. Left inner thigh and right shoulder turn-out strength, rising steadily since May.

and two more below
Lower

Jump height, 4 cm lower than in September.

Steady

Jump power, ankle bend and quick hops.

and eleven more below
For their age

Roughly typical for boys his age: mid-thigh pull force, jump height and ten-metre sprint.

and three more below
Next

We'll work on shoulder turn-out strength on his right arm, his dominant one. It was behind his left at the last two visits. Retest: the week of Dec 12.

Shaded: typical for boys his age; dashed where the study is only a rough match to how we test. Studies: Kamada 2026, Focke 2013, Gabel 2016, Mikulič 2025.

A note from Coach Dana

Mateo worked hard today. His sprint keeps getting quicker, and his left hip has caught up with his right. We will see him back in six weeks for his retest.

Where we measured

Front
Back
  • Measured directly
  • Worked by a test
  • We're watching this

Measured directly: inner thigh muscles, outer hip muscles, shoulders, hamstrings, front of the thigh, ankles. The lighter areas were worked by the jumps, squats and sprints without being measured one by one.

The watched areas are results we're keeping an eye on. We'll check this again at the retest.

That list is about athletes like him, not about his results.

An unshaded area was not part of the tests on this page.

  • We're watching this: right shoulder
  • Where athletes like him often need care: knees, front of the thigh, inner thigh, shoulders, upper back, forearms

What changed since last time

Front
Back
  • Stronger than last time
  • About the same
  • Lower than last time
  • Not compared

Each area shows how its own tests changed since the last visit: an area measured directly follows that test, and an area worked by the tests follows each test's main result. When an area's results differ, a lower one shows first.

Not compared: a test that is new this time, attempts that varied, discomfort noted during the test, a range of motion, which has no better or worse direction, or a result not measured this time.

Tested on a day that differed from last time.

Left and right

Front
Back
  • Sides about even
  • Lower on the dominant side
  • Not compared

Only the areas a strength test measured one side at a time are compared. A side is marked lower when the two sides are further apart than the target and the attempts were consistent; the other side of that area is left unmarked.

Sides are named dominant and non-dominant where we recorded which side leads, otherwise left and right.

The letters under each figure mark the athlete's own right and left.

  • Lower side: shoulder on the right, the dominant side
  • Sides about even: inner thigh, glutes and outer hip, hamstrings, front of the thigh

Growth

He grew 3 cm and gained about 3 kg since May, at a steady pace. He is not growing fast right now.

Some growing is still ahead.

Where Mateo is growing

+3.0 cmtaller since May 16
2 of 7body parts grew

Most of it is in the legs: the shins and thighs grew most, and the trunk hasn't caught up yet.

Height 169.7 cm +3.0 cmArm span 173.2 cm +3.0 cm

Tap a part of the body, or a row, for its numbers.

About the sameGrew more

Grown since May 16

Shins+1.3 cm
Left38.9 cmwas 37.5 cm
Right39.1 cmwas 37.8 cm

Left Right

Knee to ankle. The shins often grow first when a child is growing fast, ahead of the thighs and the trunk.

Accurate to about ±1.0 cm, so a small change can be noise.

Thighs+1.1 cm
Left40.2 cmwas 39.1 cm
Right40.5 cmwas 39.5 cm

Left Right

Hip to knee. The thighs usually follow the shins.

Accurate to about ±1.0 cm, so a small change can be noise.

Trunkabout the same
53.6 cmwas 53.0 cm

Hips to shoulders. The trunk tends to grow last, after the legs.

Accurate to about ±1.0 cm, so a small change can be noise.

Upper armsabout the same
Left28.4 cmwas 27.7 cm
Right28.7 cmwas 28.0 cm

Left Right

Shoulder to elbow.

Accurate to about ±1.0 cm, so a small change can be noise.

Forearmsabout the same
Left23.4 cmwas 22.8 cm
Right23.6 cmwas 23.0 cm

Left Right

Elbow to wrist.

Accurate to about ±1.0 cm, so a small change can be noise.

Handsabout the same
Left18.6 cmwas 18.4 cm
Right18.8 cmwas 18.6 cm

Left Right

Wrist to fingertip. Hands and feet are often the first to grow, before it shows in height.

Accurate to about ±1.0 cm, so a small change can be noise.

Feetabout the same
Left26.1 cmwas 25.7 cm
Right26.3 cmwas 25.9 cm

Left Right

Heel to toe. Hands and feet are often the first to grow, before it shows in height.

Accurate to about ±1.0 cm, so a small change can be noise.

Every measurement
cmMay 16Jun 27Aug 8Sep 19Oct 31Grown
Height166.7167.5168.3169.0169.7+3.0
Arm span170.2171.0171.8172.5173.2+3.0
Trunk53.053.253.353.553.6~
Upper arms27.7 / 28.027.9 / 28.228.1 / 28.428.3 / 28.628.4 / 28.7~
Forearms22.8 / 23.023.0 / 23.223.1 / 23.323.3 / 23.523.4 / 23.6~
Hands18.4 / 18.618.4 / 18.618.5 / 18.718.5 / 18.718.6 / 18.8~
Thighs39.1 / 39.539.4 / 39.739.7 / 40.040.0 / 40.340.2 / 40.5+1.1
Shins37.5 / 37.837.9 / 38.138.3 / 38.538.6 / 38.838.9 / 39.1+1.3
Feet25.7 / 25.925.8 / 26.025.9 / 26.126.0 / 26.226.1 / 26.3~

Two numbers are left / right. The camera reads each length to about a centimetre, so a small difference between sides, or between visits, is normal.

Height, in

657068.6 to 72.8Retest66.8Age1415161718
  • Typical for boys his age
  • The middle of the group at each age
  • Estimated path and range, from the birth parents' heights

An estimate with a margin of error, not a promise. Growth can run earlier or later than typical.

Growing about 2.6 in a year since May 2026.

Height, cm

160170180174.3 to 184.9Retest169.7Age1415161718
  • Typical for boys his age
  • The middle of the group at each age
  • Estimated path and range, from the birth parents' heights

An estimate with a margin of error, not a promise. Growth can run earlier or later than typical.

Growing about 6.5 cm a year since May 2026.

Body mass, lbs

100120140Retest129Age1415
  • Typical for boys his age
  • The middle of the group at each age

Body mass, kg

405060Retest59Age1415
  • Typical for boys his age
  • The middle of the group at each age
Height
5 ft 6.8 in169.7 cm
Up 1.2 in since MayUp 3 cm since May

Height is how tall he stands. He has grown steadily over his five visits, and his height is typical for boys his age.

Why we test it: Every other result moves as the body grows, so height tells us how to read them.

Body mass
129 lbs58.5 kg
Up 7.1 lbs since MayUp 3.2 kg since May

Body mass is his weight, taken on the force plates. He has gained weight steadily over his five visits, and it is typical for boys his age.

Why we test it: Strength and power are judged for body size, so weight is part of every one of them.

Sitting height
34.4 in87.4 cm
Steady since Sep

Sitting height is how tall he is from the seat up. It is about the same across his visits, so most of his recent growth has been in his legs.

Why we test it: Trunk and leg length grow at different times, and the split helps us read growth timing.

Leg length
32.4 in82.3 cm
Up 1 in since MayUp 2.5 cm since May

Leg length is how long his legs are. His legs have grown steadily over his five visits, and that is where most of his new height came from.

Why we test it: Leg length sets stride length in running and changes how a squat or a jump looks.

Arm span
5 ft 8.2 in173.2 cm
Up 1.2 in since MayUp 3 cm since May

Arm span is fingertip to fingertip with the arms out wide. It has grown steadily over his five visits, in step with his height.

Why we test it: A longer reach helps in blocking, shooting, swimming, throwing and striking.

This shows how much longer his arm span is than his height. His span has stayed a little longer than his height at every visit, with no change since May.

Hand length
7.4 in18.7 cm
Steady since Sep

Hand length is how long his hand is. It is about the same across his visits.

Why we test it: Hand size matters for gripping, catching and handling a ball or a bat.

Foot length
10.3 in26.2 cm
Steady since Sep

Foot length is how long his foot is. It is about the same across his visits.

Why we test it: Foot size is an early sign of growth, and it shapes the push off the ground.

At each visit we measure height and sitting height, the force plates weigh the body, and the camera adds arm span and hand and foot length. They show how much a body has changed since last time, which helps us read every other result fairly.

Movement: Steady across the board

Ankle bend, the overhead squat and shoulder range are all about the same as at his first visit. Fielding a ground ball low and striding off the mound both need ankles that bend freely.

Ankle bend, standing

41° 4.6 in11.8 cm Other leg · L 39° 4.4 in11.2 cm Kicking leg · R
Other leg · L
41°
4.611.8incm past the toes
Kicking leg · R
39°
4.411.2incm past the toes
Heel down, the shin tips forward 41° on the left and 39° on the right.
Left41°Right39°
3738394041Retestweek of Dec 124139LRMay 16Aug 8Oct 31

Ankle bend, standing, is how far the ankle bends with the heel down. It helps a shortstop stay low on a ground ball. Both sides are about the same as at his first visit. His left ankle bends a little more than his right.

Why we test it: Ankle bend sets how deep an athlete can squat and how softly they can land.

Overhead squat, knee bend

Left102.8°Right101.8°
101102103104Retestweek of Dec 12102.8101.8LRMay 16Aug 8Oct 31

This is how far the knee bends at the bottom of a deep squat. Both sides bend about 102 to 103 degrees, nearly even. It is about the same as at earlier visits.

Why we test it: A deep, smooth squat is the base for jumping, landing and lifting.

Shoulder rotation, outward

Back94°Fwd58° Other arm · L Back104°Fwd56° Throwing arm · R
Other arm · L
94°back
58° forward
Throwing arm · R
104°back
56° forward
His throwing arm turns back 104° and forward 56°; his other arm turns back 94° and forward 58°.
Left94°Right104°
95100105Retestweek of Dec 1294104LRMay 16Aug 8Oct 31

This is how far the shoulder turns the forearm back. His right shoulder turns back farther than his left. Both sides are about the same as at his first visit.

Why we test it: How far each shoulder turns back changes with throwing, and the two arms are followed against each other.

Details

Ankle bend

What we tested
Standing in a split stance and driving the front knee forward over the toes with the heel down, each side in turn, filmed by a camera that tracks the joints.
Why
How far the ankle bends sets how deep an athlete can squat and how softly they can land.

Result

Standing

L41R39°

  • Knee past the foot

    L11.8R11.2cm

    This is how far the knee travels past the toes with the heel down. Both sides are about the same as at his first visit. The left knee reaches a little farther than the right.

    Why we test it: It shows how much room the ankle gives for squatting, landing and stopping.

All the numbers
MeasureLeftRightDifferenceSince the startSince last timeStatusHistory
Ankle bend, standing41°39°2°L2° morefrom 38.9R2° morefrom 37BothAbout the samewithin 7°No targetLHistory across 5 sessions2026-05-16: 38.9; 2026-06-27: 39.5; 2026-08-08: 40.2; 2026-09-19: 40.6; 2026-10-31: 41RHistory across 5 sessions2026-05-16: 37; 2026-06-27: 37.6; 2026-08-08: 38.2; 2026-09-19: 38.6; 2026-10-31: 39
Ankle bend, knee past the foot11.8cm11.2cm0.6cmL1 cm higherfrom 11.1R1 cm higherfrom 10.5BothAbout the samewithin 2.5 cmNo targetLHistory across 5 sessions2026-05-16: 11.1; 2026-06-27: 11.3; 2026-08-08: 11.5; 2026-09-19: 11.7; 2026-10-31: 11.8RHistory across 5 sessions2026-05-16: 10.5; 2026-06-27: 10.7; 2026-08-08: 10.9; 2026-09-19: 11.1; 2026-10-31: 11.2
MeasureShownHow it was read
Ankle bend, standing, left41°consistent
Ankle bend, standing, right39°consistent
Ankle bend, knee past the foot, left11.8 cmconsistent
Ankle bend, knee past the foot, right11.2 cmconsistent

Overhead squat

What we tested
A slow, deep squat with both arms held straight overhead, filmed by a camera that tracks the joints.
Why
It shows how the ankles, knees, hips and trunk work together, which shapes how every jump and landing is absorbed.

Result

Knee bend

L102.8R101.8°

  • Ankle bend

    L29.6R24.9°

    This is how far the ankle bends at the bottom of the overhead squat. His right ankle bends a bit less than his left. Both sides are about the same as at earlier visits.

    Why we test it: A stiff ankle can stop the squat from going deep or pull the heels up.

  • Knee drift

    L3R3°

    Knee drift is how far the knee moves toward the middle in the squat. Both sides drift about 3 degrees, even with each other. It has held the same at every visit.

    Why we test it: It shows how well the hips and legs hold the knee in line under load.

  • Forward lean

    56.3°

    Forward lean is how far his chest tips forward in the deep squat. He leans about 56 degrees, the same at every visit.

    Why we test it: It shows how the ankles, hips and upper back share the work of a deep squat.

All the numbers
MeasureLeftRightDifferenceSince the startSince last timeStatusHistory
Overhead squat, ankle bend29.6°24.9°—BothSame as the startBothAbout the samewithin 8°No targetLHistory across 5 sessions2026-05-16: 29.9; 2026-06-27: 29.3; 2026-08-08: 30; 2026-09-19: 29.4; 2026-10-31: 29.6RHistory across 5 sessions2026-05-16: 25.1; 2026-06-27: 24.6; 2026-08-08: 25.2; 2026-09-19: 24.7; 2026-10-31: 24.9
Overhead squat, knee drift3°3°—BothSame as the startBothAbout the samewithin 4°No targetLHistory across 5 sessions2026-05-16: 3; 2026-06-27: 2.9; 2026-08-08: 3; 2026-09-19: 3; 2026-10-31: 3RHistory across 5 sessions2026-05-16: 3.1; 2026-06-27: 3; 2026-08-08: 3.1; 2026-09-19: 3; 2026-10-31: 3
Overhead squat, knee bend102.8°101.8°—L1° lessfrom 103.8R1° lessfrom 102.8BothAbout the samewithin 11.9°No targetLHistory across 5 sessions2026-05-16: 103.8; 2026-06-27: 101.8; 2026-08-08: 104.4; 2026-09-19: 102.3; 2026-10-31: 102.8RHistory across 5 sessions2026-05-16: 102.8; 2026-06-27: 100.8; 2026-08-08: 103.3; 2026-09-19: 101.3; 2026-10-31: 101.8
Overhead squat, forward lean56.3°not sided—Same as the startAbout the samewithin 8°No targetHistory across 5 sessions2026-05-16: 56.3; 2026-06-27: 56.3; 2026-08-08: 56.3; 2026-09-19: 56.3; 2026-10-31: 56.3
Overhead squat, hip tiltThe camera reads this a little off for most athletes, so it is shown but not yet compared.52.2°not sided————History across 5 sessions2026-05-16: 52.2; 2026-06-27: 52.2; 2026-08-08: 52.2; 2026-09-19: 52.2; 2026-10-31: 52.2
MeasureShownHow it was read
Overhead squat, knee bend, left102.8°consistent
Overhead squat, knee bend, right101.8°consistent
Overhead squat, ankle bend, left29.6°consistent
Overhead squat, ankle bend, right24.9°consistent
Overhead squat, knee drift, left3°consistent
Overhead squat, knee drift, right3°consistent
Overhead squat, forward lean56.3°consistent
Overhead squat, hip tilt52.2°consistent

Shoulder range

What we tested
The arm out at shoulder height, turning the forearm back and then forward as far as it goes, in front of the camera.
Why
How far each shoulder turns changes with throwing, and the two arms are followed against each other.

Result

Shoulder rotation, outward

L94R104°

  • Shoulder rotation, inward

    L58R56°

    This is how far the shoulder turns the forearm forward. His left and right sides are close. Both are about the same as at earlier visits.

    Why we test it: How far each shoulder turns forward changes with throwing, and the two arms are followed against each other.

All the numbers
MeasureLeftRightDifferenceSince the startSince last timeStatusHistory
Shoulder rotation, outward94°104°10°L1° lessfrom 94.9R1° lessfrom 105BothAbout the samewithin 14.9°No targetLHistory across 5 sessions2026-05-16: 94.9; 2026-06-27: 93.1; 2026-08-08: 95.4; 2026-09-19: 93.5; 2026-10-31: 94RHistory across 5 sessions2026-05-16: 105; 2026-06-27: 103; 2026-08-08: 105.6; 2026-09-19: 103.5; 2026-10-31: 104
Shoulder rotation, inward58°56°—L1° lessfrom 58.6R11° morefrom 44.8BothAbout the samewithin 14.9°No targetLHistory across 5 sessions2026-05-16: 58.6; 2026-06-27: 57.4; 2026-08-08: 58.9; 2026-09-19: 57.7; 2026-10-31: 58RHistory across 5 sessions2026-05-16: 44.8; 2026-06-27: 47.6; 2026-08-08: 50.4; 2026-09-19: 53.2; 2026-10-31: 56
MeasureShownHow it was read
Shoulder rotation, outward, left94°consistent
Shoulder rotation, outward, right104°consistent
Shoulder rotation, inward, left58°consistent
Shoulder rotation, inward, right56°consistent

Power: Jump height dipped, power held

Jump height fell 4 cm since September but is still roughly typical for his age. Jump power held and is higher than most boys his age. Both legs share the push evenly. A strong push off the ground drives a shortstop's first step and a pitcher's stride.

Jump height

11 in28 cm
101112Retestweek of Dec 1210.912.611May 16Aug 8Oct 31
  • Typical for boys his age
2426283032Retestweek of Dec 1227.63228May 16Aug 8Oct 31
  • Typical for boys his age

Study: Focke 2013

Bodyweight Hardest braking242% Dip1.08 m/s Slowingdown Drivingup Take-off
Braking amount
40.3force-seconds
The blue area: how much the dip was slowed
Hardest braking
242% of body weight
The most force while slowing the dip
From this jump: the dip was 1.08 m/s at its fastest and was braked with a force of 242% of his body weight before driving up.

Jump height is how high he jumps from a quick dip. It shows the leg push behind a pitcher's stride. It dropped 4 cm since September, back near his May result. He dipped as deep as last time. Roughly, it is still typical for boys his age.

Why we test it: Jumping, sprinting and changing direction all start with this push off the ground.

Jump power

54.3 watts per kilo
45505560Retestweek of Dec 1250.45654.3May 16Aug 8Oct 31
  • Typical for boys his age, continues below the chart
  • Normal test-to-test range

Study: Gabel 2016

Jump power is the most power his legs make, for body size. Power is what a shortstop's quick first step needs. It is about the same as last time and higher than most boys his age.

Why we test it: Power is strength delivered fast, which is what a quick first step needs.

Details

Countermovement jump

What we tested
A standing jump as high as possible from a quick dip, hands on hips, on force plates. Three attempts.
Why
Jumping, sprinting and changing direction all start with this push off the ground, and it is the most studied test of leg power.

Result

Jump height

28cm

Typical for boys his age

Study: Focke 2013

This range is estimated from the study's average and spread, not counted from its athletes.

  • Jump power

    54.3W/kg

    Higher than most boys his age

    Study: Gabel 2016

More from this test

This checks his two sides at the top of the jump push. They are about 2 percent apart. That is inside our working target. It has held there at every visit.

Why we test it: Both legs should share the push, and a gap can mean one leg does more of the work.

This compares his two sides across the whole jump push. They are about 3 percent apart, inside our working target. Both legs share the work evenly.

Why we test it: It shows whether one leg is doing more of the work from the start of the push to take-off.

All the numbers
MeasureLatestSince the startBestSince last timeStatusHistory
Jump height28cm1% higherfrom 27.6 cm32cmWorseTested on a day that differed from last time.past the 10.5% day-to-day variationNo targetHistory across 5 sessions2026-05-16: 27.6; 2026-06-27: 29.2; 2026-08-08: 30.8; 2026-09-19: 32; 2026-10-31: 28. The shaded area is 10.5% either side of the latest value.
Jump power54.3W/kg8% higherfrom 50.4 W/kg56W/kgAbout the samewithin the 11.6% day-to-day variation (placeholder)No targetHistory across 5 sessions2026-05-16: 50.4; 2026-06-27: 52.1; 2026-08-08: 54.3; 2026-09-19: 56; 2026-10-31: 54.3. The shaded area is 11.6% either side of the latest value.
Jump, slowing down: peak force243% of body weight——About the samelimit provisionalwithin the 11.6% day-to-day variation (placeholder)No targetHistory across 5 sessions2026-05-16: 225; 2026-06-27: 232; 2026-08-08: 243; 2026-09-19: 250; 2026-10-31: 243. The shaded area is 11.6% either side of the latest value.
Jump, slowing down: braking amount40.3force-seconds——About the samelimit provisionalwithin the 11.6% day-to-day variation (placeholder)No targetHistory across 5 sessions2026-05-16: 35.4; 2026-06-27: 37.1; 2026-08-08: 39.3; 2026-09-19: 41.1; 2026-10-31: 40.3. The shaded area is 11.6% either side of the latest value.
Jump, slowing down: speed into the dip1.08m/s——About the samelimit provisionalwithin the 11.6% day-to-day variation (placeholder)No targetHistory across 5 sessions2026-05-16: 1.04; 2026-06-27: 1.06; 2026-08-08: 1.08; 2026-09-19: 1.1; 2026-10-31: 1.08. The shaded area is 11.6% either side of the latest value.
Jump push-off at its peak, left vs rightright lower by 2%———

Target: the two sides

Evenunder 5%
In rangeunder 10%
Out of range10 to 15%
Flagged15% and over
This difference2%, right lower

These are APX's working thresholds, placeholders re-centred on the gym's own results as they arrive; there is no universal rule for how far two sides may differ, and the research says each test needs its own.

Source: APX working target (placeholder); Bishop 2018.

Jump landing, left vs rightThis varied between jumps, so it is shown but not yet compared or judged.28.4% apart————
Jump push-off as a whole, left vs rightleft lower by 2.9%———

Target: the two sides

Evenunder 5%
In rangeunder 10%
Out of range10 to 15%
Flagged15% and over
This difference2.9%, left lower

These are APX's working thresholds, placeholders re-centred on the gym's own results as they arrive; there is no universal rule for how far two sides may differ, and the research says each test needs its own.

Source: APX working target (placeholder); Bishop 2018.

MeasureAttemptsShownHow it was read
Jump height28 / 27.8 / 27.928 cmconsistent
Jump power54.3 / 53.4 / 53.554.3 W/kgconsistent
Jump push-off at its peak, left vs right-1.6 / -2.3 / -2-2 %consistent
Jump landing, left vs right29.3 / 28.7 / 27.328.4 %consistent
Jump, slowing down: peak force242 / 243 / 244243 % of body weightconsistent
Jump, slowing down: braking amount40.3 / 40.5 / 38.940.3 force-secondsconsistent
Jump, slowing down: speed into the dip1.08 / 1.16 / 1.081.08 m/sconsistent
Jump push-off as a whole, left vs right2.8 / 0.9 / 5.12.9 %consistent
Jump, time from dip to take-off0.85 / 0.82 / 0.890.85 sconsistent
Jump, depth of the dip29.1 / 29.5 / 30.729.5 cmconsistent

Reactive strength: About the same as last time

Quick hops and jump quickness have both held about the same over his visits. A shortstop has to react and go in a split second, and springy legs help him do it.

Quick hops

1.3
0.2 s on the ground 0.27 s in the air
In the air
0.27s
Each hop
On the ground
0.2s
Each contact
Score 1.3: 0.27 s in the air for every 0.2 s on the ground.
11.21.41.6Retestweek of Dec 121.21.3May 16Aug 8Oct 31
  • Normal test-to-test range

Quick hops show how high he hops for how little time on the ground. Springy legs help a shortstop react and go. His result is about the same as last time and has stayed within normal day-to-day variation over his visits.

Why we test it: Most of sport is landing and going again, and this shows how springy the ankles and legs are.

Jump quickness

0.34 m/s
Dip and brakePush 0 s 0.82 s Height
0.28mheight10.9 in÷0.82sdip to take-off=0.34m/sjump quickness
From this jump: 0.34 metres for every second spent getting off the ground.
0.320.340.360.38Retestweek of Dec 120.310.350.34May 16Aug 8Oct 31
  • Normal test-to-test range

Jump quickness is how high the jump goes for how fast he dips and pushes. It is about the same as last time and has held steady over his visits.

Why we test it: A jump that is both high and quick shows springy power that sport can use.

Details

Quick hops

What we tested
Quick hops in place on the force plates, as high as possible with as little time on the ground as possible.
Why
Most of sport is landing and going again, and this shows how springy the ankles and legs are.

Result

Quick hops

1.34

All the numbers
MeasureLatestSince the startBestSince last timeStatusHistory
Quick hops1.3414% higherfrom 1.181.34About the sameacross the last three testswithin the 23.3% day-to-day variationNo targetHistory across 5 sessions2026-05-16: 1.18; 2026-06-27: 1.23; 2026-08-08: 1.27; 2026-09-19: 1.31; 2026-10-31: 1.34. The shaded area is 23.3% either side of the latest value.
MeasureAttemptsShownHow it was read
Quick hops1.34 / 1.271.34consistent
Quick hops, time on the ground0.2 / 0.210.2 sone reading

Jump quickness

What we tested
Read from the same standing jump: how high it went for how long the dip and push took.
Why
Sport rarely gives time to wind up, so a jump that is both high and quick shows springy, usable power.

Result

Jump quickness

0.34m/s

No study covers this age yet.

All the numbers
MeasureLatestSince the startBestSince last timeStatusHistory
Jump quickness0.34m/s10% higherfrom 0.31 m/s0.35m/sAbout the samewithin the 11.6% day-to-day variation (placeholder)No targetHistory across 5 sessions2026-05-16: 0.31; 2026-06-27: 0.32; 2026-08-08: 0.34; 2026-09-19: 0.35; 2026-10-31: 0.34. The shaded area is 11.6% either side of the latest value.
MeasureAttemptsShownHow it was read
Jump quickness0.33 / 0.34 / 0.310.34 m/sconsistent

Strength: Getting stronger over the visits

Mid-thigh pull force rose 17% since June and is roughly typical for his age. Left inner thigh strength rose, closing the gap to the right side. Right shoulder turn-out strength rose too, but still trails the left. A pitcher's drive off the mound starts in the legs.

Mid-thigh pull

351% of body weight
280300320340360Retestweek of Dec 12288351May 16Aug 8Oct 31

Mid-thigh pull is how hard he pulls on a fixed bar, for body size. It is whole-body strength, the base for a pitcher's drive. His pulls were consistent this time.

Why we test it: It is the clearest single measure of whole-body strength, which sits under speed and jumping.

Mid-thigh pull, peak force

452 lbs2013 N
350400450500Retestweek of Dec 12351first try386452May 16Aug 8Oct 31
  • Typical for boys his age
  • Normal test-to-test range
1600180020002200Retestweek of Dec 121560first try17182013May 16Aug 8Oct 31
  • Typical for boys his age
  • Normal test-to-test range

This is his hardest pull on the bar, with no allowance for size. It rose 17% since June, a steady climb over four visits. Roughly, it is typical for boys his age. His May pull was a first try to learn the test.

Why we test it: It shows total strength, which grows as the athlete grows.

Hip strength

Other leg · L Kicking leg · R Inner thighpulls inOuter hippushes out
Inner thigh
70310.4lbsN
Other leg
74329.9lbsN
Kicking leg
Pulling the knee in
Outer hip
63281.6lbsN
Other leg
64286.7lbsN
Kicking leg
Pushing it out
In a landing or a cut, the inner thigh and the outer hip hold each knee in line between them.
Inner thigh
Left54%Right57%
Outer hip
Left49%Right50%
  • Typical for boys his age

Percent of body weight.

Hip inner thigh over time

40506070Retestweek of Dec 125457LRMay 16Aug 8Oct 31
  • Typical for boys his age

Hip inner thigh is how hard the inner thigh presses the knees together, for body size. His two sides are close. Both are roughly typical for boys his age.

Why we test it: These muscles steady the hips and knees when landing and changing direction.

Hip outer hip is how hard the outer hip pushes the knees apart, for body size. His two sides are nearly even. Both are roughly typical for boys his age.

Why we test it: These muscles hold the hips level and steady the knee when running and cutting.

Shoulder rotation strength

Shoulder Wind-up Release Follow-through

Throwing arm · R

Engine · turn-in
29130lbsN
Whips the arm forward to release
Brakes · turn-out
26115.4lbsN
Slows the arm once the ball is gone
89%
Brakes as a share of the engine
Throwing arm · R 89%
Other arm · L 107%
On his throwing arm the brakes are 89% as strong as the engine.
Turn-out strengthRight 13% lower
Left23%Right20%
Turn-in strength
Left22%Right23%

Percent of body weight.

Shoulder turn-out strength over time

1520Retestweek of Dec 122320LRMay 16Aug 8Oct 31

Shoulder turn-out strength is how hard the shoulder turns the arm outward, for body size. His right side is lower than his left.

Why we test it: The muscles that turn the arm out slow it down at the end of every throw.

Shoulder turn-in strength is how hard the shoulder turns the arm inward, for body size. It drives the arm through a throw. His two sides are close.

Why we test it: The muscles that turn the arm in drive the arm through a throw or a swing.

Hamstring pull

Knee Swing Fastest Footstrike

Kicking leg · R

Engine · thigh
83371.1lbsN
Swings the lower leg through
Brakes · hamstring
54240.3lbsN
Slows it before the foot lands
65%
Brakes as a share of the engine
Kicking leg · R 65%
Other leg · L 64%
On his kicking leg the brakes are 65% as strong as the engine.
Left41%Right42%

Percent of body weight.

3436384042Retestweek of Dec 124142LRMay 16Aug 8Oct 31

Hamstring pull is how hard the back of the thigh pulls the heel in, for body size. It helps in every sprinting stride. His two sides are even.

Why we test it: The back of the thigh brakes the leg in every sprinting stride.

Thigh push

Sitting with the knee bent part way, the shin pushes forward and up against a pad at the front of the ankle.

Left64%Right65%

Percent of body weight.

556065Retestweek of Dec 126465LRMay 16Aug 8Oct 31

Thigh push is how hard the front of the thigh pushes the shin forward, for body size. It drives jumps and cuts. His two sides are even.

Why we test it: The front of the thigh absorbs landings and drives jumps and cuts.

Details

Mid-thigh pull

What we tested
Standing on force plates and pulling as hard as possible on a fixed bar at thigh height for a few seconds.
Why
It is the clearest single measure of whole-body strength, which sits under speed and jumping.

Result

Mid-thigh pull

351% of body weight

  • Peak force

    2012.5N

    Typical for boys his age

    A rough reference: a small group of academy basketball players at one club, pulling on different force plates.

    This range is estimated from the study's average and spread, not counted from its athletes.

All the numbers
MeasureLatestSince the startBestSince last timeStatusHistory
Mid-thigh pull351% of body weight————History across 5 sessions2026-05-16: 288; 2026-06-27: 312; 2026-08-08: 330; 2026-09-19: 340; 2026-10-31: 351. The shaded area is 11.4% either side of the latest value.
Mid-thigh pull, peak force2012.5N17% higherfrom 1717.6 N2012.5NAbout the samewithin the 11.4% day-to-day variationNo targetHistory across 5 sessions2026-05-16: 1559.9; 2026-06-27: 1717.6; 2026-08-08: 1843.2; 2026-09-19: 1928.8; 2026-10-31: 2012.5. The shaded area is 11.4% either side of the latest value.
Mid-thigh pull, early forceForce in the first moments of the pull varies a lot in young athletes, so it is shown but not yet compared.1438N/s————History across 5 sessions2026-05-16: 1115; 2026-06-27: 1227; 2026-08-08: 1317; 2026-09-19: 1378; 2026-10-31: 1438
MeasureAttemptsShownHow it was read
Mid-thigh pull337 / 344 / 351351 % of body weightconsistent
Mid-thigh pull, peak force1931.3 / 1971.1 / 2012.52012.5 Nconsistent
Mid-thigh pull, early force—1438 N/sone reading

Hip strength

What we tested
Lying on the back with pads at the knees: press the knees together as hard as possible, then push them apart, on a strength frame.
Why
The inner thigh and outer hip muscles steady the hips and knees when landing and changing direction.

Result

Hip inner thigh

L54R57% of body weight

Typical for boys his age

A small study: treat this as a rough comparison.

This range is estimated from the study's average and spread, not counted from its athletes.

  • Hip inner thigh (force)

    L310.4R329.9N

    This is how hard his inner thigh presses, with no allowance for size. His left side rose steadily since May, and the gap between sides narrowed from 24 to 5 percent. The right side is about the same. Both sides press harder than the outer hip pushes, the balance we look for.

    Why we test it: Strength in the inner thigh rises as the athlete grows, so we follow total force to see real progress.

  • Hip outer hip

    L49R50% of body weight

    Typical for boys his age

    A small study: treat this as a rough comparison.

    This range is estimated from the study's average and spread, not counted from its athletes.

  • Hip outer hip (force)

    L281.6R286.7N

    This is how hard his outer hip pushes, with no allowance for size. Both sides are about the same as last time and sit about 4 percent apart. The inner thigh is stronger than the outer hip on both sides, the balance we look for.

    Why we test it: Strength in the outer hip rises as the athlete grows, so we follow total force to see real progress.

All the numbers
MeasureLatestSince the startBestSince last timeStatusHistory
Hip inner thighL54R57% of body weightBoth—L—R—Both——LHistory across 5 sessions2026-05-16: 37; 2026-06-27: 41; 2026-08-08: 46; 2026-09-19: 50; 2026-10-31: 54. The shaded area is 25.6% either side of the latest value.RHistory across 5 sessions2026-05-16: 49; 2026-06-27: 52; 2026-08-08: 54; 2026-09-19: 56; 2026-10-31: 57. The shaded area is 25.6% either side of the latest value.
Hip inner thigh (force)L310.4R329.9Nleft lower by 4.6%L54% higherfrom 201.9R23% higherfrom 268.2L310.4R329.9BothAbout the samewithin the 25.6% day-to-day variation

Target: the two sides

Evenunder 5%
In rangeunder 10%
Out of range10 to 15%
Flagged15% and over
This difference4.6%, left lower

These are APX's working thresholds, placeholders re-centred on the gym's own results as they arrive; there is no universal rule for how far two sides may differ, and the research says each test needs its own.

Source: APX working target (placeholder); Bishop 2018.

LHistory across 5 sessions2026-05-16: 201.9; 2026-06-27: 227.7; 2026-08-08: 255.9; 2026-09-19: 282.6; 2026-10-31: 310.4. The shaded area is 25.6% either side of the latest value.RHistory across 5 sessions2026-05-16: 268.2; 2026-06-27: 284.7; 2026-08-08: 302.2; 2026-09-19: 316.2; 2026-10-31: 329.9. The shaded area is 25.6% either side of the latest value.
Hip outer hipL49R50% of body weightBoth—L—R—Both——LHistory across 5 sessions2026-05-16: 42; 2026-06-27: 44; 2026-08-08: 46; 2026-09-19: 48; 2026-10-31: 49. The shaded area is 25.6% either side of the latest value.RHistory across 5 sessions2026-05-16: 43; 2026-06-27: 45; 2026-08-08: 47; 2026-09-19: 49; 2026-10-31: 50. The shaded area is 25.6% either side of the latest value.
Hip outer hip (force)L281.6R286.7Nleft lower by 3.9%L23% higherfrom 228.9R23% higherfrom 233.1L281.6R286.7BothAbout the samewithin the 25.6% day-to-day variation (placeholder)

Target: the two sides

Evenunder 5%
In rangeunder 10%
Out of range10 to 15%
Flagged15% and over
This difference3.9%, left lower

These are APX's working thresholds, placeholders re-centred on the gym's own results as they arrive; there is no universal rule for how far two sides may differ, and the research says each test needs its own.

Source: APX working target (placeholder); Bishop 2018.

LHistory across 5 sessions2026-05-16: 228.9; 2026-06-27: 243; 2026-08-08: 257.9; 2026-09-19: 269.8; 2026-10-31: 281.6. The shaded area is 25.6% either side of the latest value.RHistory across 5 sessions2026-05-16: 233.1; 2026-06-27: 247.5; 2026-08-08: 262.6; 2026-09-19: 274.8; 2026-10-31: 286.7. The shaded area is 25.6% either side of the latest value.
Hip inner thigh compared with outer hipL1.10R1.15target: at least nine tenths———

Target: inner thigh against outer hip

Targetat least 0.90
Left1.10
Right1.15

Inner thigh strength well below outer hip strength is the pattern most often trained. The target comes from elite youth soccer and is a prompt to look closer, not a rule.

Source: Wollin 2018.

MeasureAttemptsShownHow it was read
Hip inner thigh, left52 / 54 / 5254 % of body weightconsistent
Hip inner thigh, right53 / 57 / 5557 % of body weightconsistent
Hip inner thigh (force), left300.4 / 310.4 / 295.9310.4 Nconsistent
Hip inner thigh (force), right304 / 329.9 / 317.4329.9 Nconsistent
Hip outer hip, left49 / 47 / 4649 % of body weightconsistent
Hip outer hip, right49 / 48 / 5050 % of body weightconsistent
Hip outer hip (force), left281.6 / 269 / 262.8281.6 Nconsistent
Hip outer hip (force), right282.2 / 277.7 / 286.7286.7 Nconsistent
Hip inner thigh, left vs right1.2 / 5.9 / 6.84.6 %consistent
Hip outer hip, left vs right0.2 / 3.1 / 8.43.9 %consistent

Shoulder rotation strength

What we tested
Lying on the back with the arm out: turn the forearm back, then forward, against a fixed pad.
Why
The muscles that turn the arm in and out control the shoulder through every throw.

Result

Shoulder turn-out strength

L23R20% of body weight

  • Shoulder turn-out strength (force)

    L134.6R115.4N

    This is how hard the shoulder turns the arm outward, with no allowance for size. For a pitcher, these muscles slow the arm after each throw. His right arm, his dominant one, rose since May, and the gap narrowed from 26 to 14 percent. The right was still behind at the last two visits.

    Why we test it: Strength in the shoulder turn-out rises as the athlete grows, so we follow total force to see real progress.

  • Shoulder turn-in strength

    L22R23% of body weight

  • Shoulder turn-in strength (force)

    L125.7R130N

    This is how hard his shoulder turns the arm inward, with no allowance for size. Both sides are about the same as last time and sit about 2 percent apart.

    Why we test it: Strength in the shoulder turn-in rises as the athlete grows, so we follow total force to see real progress.

All the numbers
MeasureLatestSince the startBestSince last timeStatusHistory
Shoulder turn-out strengthL23R20% of body weightBoth—L—R—Both——LHistory across 5 sessions2026-05-16: 20; 2026-06-27: 21; 2026-08-08: 22; 2026-09-19: 23; 2026-10-31: 23. The shaded area is 25.6% either side of the latest value.RHistory across 5 sessions2026-05-16: 15; 2026-06-27: 16; 2026-08-08: 18; 2026-09-19: 19; 2026-10-31: 20. The shaded area is 25.6% either side of the latest value.
Shoulder turn-out strength (force)L134.6R115.4Nright lower by 14.2%L23% higherfrom 109.4R42% higherfrom 81.1L134.6R115.4BothAbout the samewithin the 25.6% day-to-day variation (placeholder)

Target: the two sides

Evenunder 5%
In rangeunder 10%
Out of range10 to 15%
Flagged15% and over
This difference14.2%, right lower

These are APX's working thresholds, placeholders re-centred on the gym's own results as they arrive; there is no universal rule for how far two sides may differ, and the research says each test needs its own.

Source: APX working target (placeholder); Bishop 2018.

LHistory across 5 sessions2026-05-16: 109.4; 2026-06-27: 116.2; 2026-08-08: 123.3; 2026-09-19: 129; 2026-10-31: 134.6. The shaded area is 25.6% either side of the latest value.RHistory across 5 sessions2026-05-16: 81.1; 2026-06-27: 89.2; 2026-08-08: 99.1; 2026-09-19: 107.2; 2026-10-31: 115.4. The shaded area is 25.6% either side of the latest value.
Shoulder turn-in strengthL22R23% of body weightBoth—L—R—Both——LHistory across 5 sessions2026-05-16: 19; 2026-06-27: 20; 2026-08-08: 21; 2026-09-19: 21; 2026-10-31: 22. The shaded area is 25.6% either side of the latest value.RHistory across 5 sessions2026-05-16: 19; 2026-06-27: 20; 2026-08-08: 21; 2026-09-19: 22; 2026-10-31: 23. The shaded area is 25.6% either side of the latest value.
Shoulder turn-in strength (force)L125.7R130Nleft lower by 2.4%L23% higherfrom 102.1R23% higherfrom 105.7L125.7R130BothAbout the samewithin the 25.6% day-to-day variation (placeholder)

Target: the two sides

Evenunder 5%
In rangeunder 10%
Out of range10 to 15%
Flagged15% and over
This difference2.4%, left lower

These are APX's working thresholds, placeholders re-centred on the gym's own results as they arrive; there is no universal rule for how far two sides may differ, and the research says each test needs its own.

Source: APX working target (placeholder); Bishop 2018.

LHistory across 5 sessions2026-05-16: 102.1; 2026-06-27: 108.4; 2026-08-08: 115.1; 2026-09-19: 120.4; 2026-10-31: 125.7. The shaded area is 25.6% either side of the latest value.RHistory across 5 sessions2026-05-16: 105.7; 2026-06-27: 112.2; 2026-08-08: 119.1; 2026-09-19: 124.6; 2026-10-31: 130. The shaded area is 25.6% either side of the latest value.
MeasureAttemptsShownHow it was read
Shoulder turn-out strength, left23 / 23 / 2323 % of body weightconsistent
Shoulder turn-out strength, right20 / 20 / 1920 % of body weightconsistent
Shoulder turn-out strength (force), left134.6 / 132.1 / 129.3134.6 Nconsistent
Shoulder turn-out strength (force), right115.4 / 113.4 / 111.2115.4 Nconsistent
Shoulder turn-in strength, left22 / 22 / 2122 % of body weightconsistent
Shoulder turn-in strength, right23 / 22 / 2123 % of body weightconsistent
Shoulder turn-in strength (force), left125.7 / 123.7 / 120.7125.7 Nconsistent
Shoulder turn-in strength (force), right130 / 127.5 / 121.9130 Nconsistent
Shoulder turn-out strength, left vs right-14.2 / -14.2 / -14.1-14.2 %consistent
Shoulder turn-in strength, left vs right3.3 / 3 / 12.4 %consistent

Hamstring strength

What we tested
Lying face down: pull the heel toward the seat against a fixed pad as hard as possible, each leg in turn.
Why
The back of the thigh brakes the leg in every sprinting stride.

Result

Hamstring pull

L41R42% of body weight

  • Hamstring pull (force)

    L236R240.3N

    This is how hard the back of his thigh pulls, with no allowance for size. Both sides are about the same as last time, and the two sides are almost exactly even.

    Why we test it: Strength in the back of the thigh rises as the athlete grows, so we follow total force to see real progress.

All the numbers
MeasureLatestSince the startBestSince last timeStatusHistory
Hamstring pullL41R42% of body weightBoth—L—R—Both——LHistory across 5 sessions2026-05-16: 35; 2026-06-27: 37; 2026-08-08: 39; 2026-09-19: 40; 2026-10-31: 41. The shaded area is 25.6% either side of the latest value.RHistory across 5 sessions2026-05-16: 36; 2026-06-27: 38; 2026-08-08: 39; 2026-09-19: 41; 2026-10-31: 42. The shaded area is 25.6% either side of the latest value.
Hamstring pull (force)L236R240.3Nleft lower by 0.1%L23% higherfrom 191.8R23% higherfrom 195.4L236R240.3BothAbout the samewithin the 25.6% day-to-day variation (placeholder)

Target: the two sides

Evenunder 5%
In rangeunder 10%
Out of range10 to 15%
Flagged15% and over
This difference0.1%, left lower

These are APX's working thresholds, placeholders re-centred on the gym's own results as they arrive; there is no universal rule for how far two sides may differ, and the research says each test needs its own.

Source: APX working target (placeholder); Bishop 2018.

LHistory across 5 sessions2026-05-16: 191.8; 2026-06-27: 203.7; 2026-08-08: 216.1; 2026-09-19: 226.2; 2026-10-31: 236. The shaded area is 25.6% either side of the latest value.RHistory across 5 sessions2026-05-16: 195.4; 2026-06-27: 207.4; 2026-08-08: 220.1; 2026-09-19: 230.3; 2026-10-31: 240.3. The shaded area is 25.6% either side of the latest value.
MeasureAttemptsShownHow it was read
Hamstring pull, left41 / 41 / 4041 % of body weightconsistent
Hamstring pull, right42 / 42 / 3942 % of body weightconsistent
Hamstring pull (force), left236 / 235.8 / 230.1236 Nconsistent
Hamstring pull (force), right240.3 / 239.5 / 223.1240.3 Nconsistent
Hamstring pull, left vs right1.8 / 1.6 / -3.10.1 %consistent

Thigh strength

What we tested
Seated with the knee bent: push the shin forward against a fixed pad as hard as possible, each leg in turn.
Why
It works the front of the thigh on its own, which absorbs landings and in a jump can hide one side doing more.

Result

Thigh push

L64R65% of body weight

  • Thigh push (force)

    L369.2R371.1N

    This is how hard the front of his thigh pushes, with no allowance for size. Both sides are about the same as last time and sit about 4 percent apart.

    Why we test it: Strength in the front of the thigh rises as the athlete grows, so we follow total force to see real progress.

All the numbers
MeasureLatestSince the startBestSince last timeStatusHistory
Thigh pushL64R65% of body weightBoth—L—R—Both——LHistory across 5 sessions2026-05-16: 55; 2026-06-27: 58; 2026-08-08: 61; 2026-09-19: 62; 2026-10-31: 64. The shaded area is 25.6% either side of the latest value.RHistory across 5 sessions2026-05-16: 56; 2026-06-27: 58; 2026-08-08: 61; 2026-09-19: 63; 2026-10-31: 65. The shaded area is 25.6% either side of the latest value.
Thigh push (force)L369.2R371.1Nleft lower by 4.1%L23% higherfrom 300.1R23% higherfrom 301.6L369.2R371.1BothAbout the samewithin the 25.6% day-to-day variation (placeholder)

Target: the two sides

Evenunder 5%
In rangeunder 10%
Out of range10 to 15%
Flagged15% and over
This difference4.1%, left lower

These are APX's working thresholds, placeholders re-centred on the gym's own results as they arrive; there is no universal rule for how far two sides may differ, and the research says each test needs its own.

Source: APX working target (placeholder); Bishop 2018.

LHistory across 5 sessions2026-05-16: 300.1; 2026-06-27: 318.6; 2026-08-08: 338.1; 2026-09-19: 353.8; 2026-10-31: 369.2. The shaded area is 25.6% either side of the latest value.RHistory across 5 sessions2026-05-16: 301.6; 2026-06-27: 320.2; 2026-08-08: 339.9; 2026-09-19: 355.6; 2026-10-31: 371.1. The shaded area is 25.6% either side of the latest value.
MeasureAttemptsShownHow it was read
Thigh push, left64 / 61 / 5664 % of body weightconsistent
Thigh push, right65 / 63 / 6265 % of body weightconsistent
Thigh push (force), left369.2 / 350.9 / 321.9369.2 Nconsistent
Thigh push (force), right371.1 / 359.7 / 355.7371.1 Nconsistent
Thigh push, left vs right0.5 / 2.4 / 9.54.1 %consistent

Speed: Quicker over the visits

His ten-metre time came down 0.1 seconds since May, and acceleration rose 11% over his visits. Roughly, his sprint is typical for boys his age. A quick first step gets a shortstop to more balls.

Acceleration

10 mph/s
0 yd5 yd10 yd15 yd10 mph13 mph15 mph
0–5 yd
10mph
5–10 yd
13mph
10–15 yd
15mph
His speed: 10 mph off the start, 13 mph through the middle and 15 mph over the last 5 yards.
91011Retestweek of Dec 129.210May 16Aug 8Oct 31
  • Normal test-to-test range

Acceleration is how quickly he speeds up from a standing start. It wins a shortstop the first steps to the ball. It rose 11 percent since May, a steady rise over his five visits, and is about the same as last time.

Why we test it: Getting up to speed fast wins the first few steps of most plays, and it repeats well from day to day, so it is the number we follow to see speed improve.

Ten metres

1.9 seconds
1.851.91.952Retestweek of Dec 1221.9May 16Aug 8Oct 31
  • Typical for boys his age
  • Normal test-to-test range

Ten metres is the time for the first ten metres of his sprint. His time came down 0.1 seconds since May, so he has got steadily faster over his visits. It is about the same as last time. Roughly, it is typical for boys his age.

Why we test it: The first steps decide most plays, and studies time ten metres, so this is the time we compare with the athlete's age.

Details

Sprint

What we tested
A sprint from a standing start through light gates, with a gate partway to time the first steps.
Why
The first steps decide most plays, and the split shows whether speed comes from the start or from the stride.

Result

Acceleration

10.22mph/s

  • Speed, 0 to 5 yards

    10.44mph

    This is his running speed over the first five yards. It shows how explosive his start is. It is about the same as last time and has stayed within normal day-to-day variation over his visits.

    Why we test it: It shows how explosive the start is, before the stride takes over.

  • Speed, 5 to 10 yards

    13.11mph

    This is his running speed from five to ten yards. It shows whether he keeps building speed after the start. It is about the same as last time and across his visits.

    Why we test it: It shows whether the athlete keeps building speed after the start.

  • Speed, 10 to 15 yards

    14.82mph

    This is his running speed over the last five of fifteen yards. It is the fastest part of his run. It is about the same as last time and across his visits.

    Why we test it: It is the fastest stretch of the run, so it shows how much speed the athlete carries into the open stride.

  • Ten metres

    1.9s

    Typical for boys his age

    A rough reference: their sprint started closer to the first gate than ours.

    A small study: treat this as a rough comparison.

    This range is estimated from the study's average and spread, not counted from its athletes.

All the numbers
MeasureLatestSince the startBestSince last timeStatusHistory
Acceleration10.22mph/s11% higherfrom 9.2 mph/s10.22mph/sAbout the samewithin the 9.3% day-to-day variationNo targetHistory across 5 sessions2026-05-16: 9.2; 2026-06-27: 9.5; 2026-08-08: 9.79; 2026-09-19: 10.01; 2026-10-31: 10.22. The shaded area is 9.3% either side of the latest value.
Speed, 0 to 5 yards10.44mph5% higherfrom 9.9 mph10.44mphAbout the samewithin the 11.6% day-to-day variation (placeholder)No targetHistory across 5 sessions2026-05-16: 9.9; 2026-06-27: 10.06; 2026-08-08: 10.22; 2026-09-19: 10.32; 2026-10-31: 10.44. The shaded area is 11.6% either side of the latest value.
Speed, 5 to 10 yards13.11mph5% higherfrom 12.44 mph13.11mphAbout the samewithin the 11.6% day-to-day variation (placeholder)No targetHistory across 5 sessions2026-05-16: 12.44; 2026-06-27: 12.64; 2026-08-08: 12.82; 2026-09-19: 12.98; 2026-10-31: 13.11. The shaded area is 11.6% either side of the latest value.
Speed, 10 to 15 yards14.82mph5% higherfrom 14.05 mph14.82mphAbout the samewithin the 11.6% day-to-day variation (placeholder)No targetHistory across 5 sessions2026-05-16: 14.05; 2026-06-27: 14.28; 2026-08-08: 14.51; 2026-09-19: 14.67; 2026-10-31: 14.82. The shaded area is 11.6% either side of the latest value.
Ten metres1.9s5% fasterfrom 2 s1.9sAbout the samewithin the 4.9% day-to-day variationNo targetHistory across 5 sessions2026-05-16: 2; 2026-06-27: 1.97; 2026-08-08: 1.94; 2026-09-19: 1.92; 2026-10-31: 1.9. The shaded area is 4.9% either side of the latest value.
Fifteen yards2.45s5% fasterfrom 2.58 s2.45sAbout the samewithin the 4.7% day-to-day variationNo targetHistory across 5 sessions2026-05-16: 2.58; 2026-06-27: 2.54; 2026-08-08: 2.5; 2026-09-19: 2.48; 2026-10-31: 2.45. The shaded area is 4.7% either side of the latest value.
Five yards0.98s5% fasterfrom 1.03 s0.98sAbout the samewithin the 11.6% day-to-day variation (placeholder)No targetHistory across 5 sessions2026-05-16: 1.03; 2026-06-27: 1.02; 2026-08-08: 1; 2026-09-19: 0.99; 2026-10-31: 0.98. The shaded area is 11.6% either side of the latest value.
Ten yards1.76s5% fasterfrom 1.86 s1.76sAbout the samewithin the 11.6% day-to-day variation (placeholder)No targetHistory across 5 sessions2026-05-16: 1.86; 2026-06-27: 1.83; 2026-08-08: 1.8; 2026-09-19: 1.78; 2026-10-31: 1.76. The shaded area is 11.6% either side of the latest value.
Ten to fifteen yards0.69s5% fasterfrom 0.73 s0.69sAbout the samewithin the 11.6% day-to-day variation (placeholder)No targetHistory across 5 sessions2026-05-16: 0.73; 2026-06-27: 0.72; 2026-08-08: 0.71; 2026-09-19: 0.7; 2026-10-31: 0.69. The shaded area is 11.6% either side of the latest value.
Sprint momentum308kg·m/s12% higherfrom 276 kg·m/s—About the samewithin the 11.6% day-to-day variation (placeholder)No targetHistory across 5 sessions2026-05-16: 276; 2026-06-27: 285; 2026-08-08: 294; 2026-09-19: 301; 2026-10-31: 308. The shaded area is 11.6% either side of the latest value.
MeasureAttemptsShownHow it was read
Acceleration10.22 / 1010.22 mph/sconsistent
Speed, 0 to 5 yards10.44 / 10.3210.44 mphconsistent
Speed, 5 to 10 yards13.11 / 12.9813.11 mphconsistent
Speed, 10 to 15 yards14.82 / 14.6514.82 mphconsistent
Ten metres1.9 / 1.921.9 sconsistent
Fifteen yards2.45 / 2.482.45 sconsistent
Five yards0.98 / 0.990.98 sconsistent
Ten yards1.76 / 1.781.76 sconsistent
Ten to fifteen yards0.69 / 0.70.69 sconsistent
Sprint momentum—308 kg·m/sconsistent

Change of direction: About the same on both turns

His times turning off each foot are about the same as at his first visit. Fielding means stopping hard and changing direction, like chasing a ball hit to the side.

Five-oh-five

StartTiming gate · 10 ydTurn line · 15 yd Timed
A run of 15 yards to the turn line, a turn, and back through the gate. The clock runs only from the gate to the line and back, 5 yards each way, once turning each way.
Left2.5 sRight2.45 s
2.452.52.552.6Retestweek of Dec 122.52.45LRMay 16Aug 8Oct 31

The five-oh-five times how fast he sprints, stops, turns and sprints back. Both sides are about the same as at his first visit. Turning off his right foot is a touch quicker than his left.

Why we test it: Games are played in cuts and turns, and this times the stop, the turn and the restart.

Details

Five-oh-five

What we tested
Sprint through a timing gate, plant and turn at a line five yards on, and sprint back through the gate. Two runs turning off each foot.
Why
Games are played in cuts and turns, and this times the stop, the turn and the restart on each side.

Result

Five-oh-five

L2.5R2.45s

All the numbers
MeasureLatestSince the startBestSince last timeStatusHistory
Five-oh-fiveL2.5R2.45sright lower by 2%L5% fasterfrom 2.62R4% fasterfrom 2.56L2.5R2.45BothAbout the samewithin the 6.3% day-to-day variationNo targetLHistory across 5 sessions2026-05-16: 2.62; 2026-06-27: 2.58; 2026-08-08: 2.55; 2026-09-19: 2.52; 2026-10-31: 2.5. The shaded area is 6.3% either side of the latest value.RHistory across 5 sessions2026-05-16: 2.56; 2026-06-27: 2.53; 2026-08-08: 2.5; 2026-09-19: 2.47; 2026-10-31: 2.45. The shaded area is 6.3% either side of the latest value.
Turn costL0.74R0.69sright lower by 6.8%L0.02 s fasterfrom 0.76R0.01 s fasterfrom 0.7L0.74R0.69BothAbout the samewithin 0.19 s (placeholder)No targetLHistory across 5 sessions2026-05-16: 0.76; 2026-06-27: 0.75; 2026-08-08: 0.75; 2026-09-19: 0.74; 2026-10-31: 0.74RHistory across 5 sessions2026-05-16: 0.7; 2026-06-27: 0.7; 2026-08-08: 0.7; 2026-09-19: 0.69; 2026-10-31: 0.69
MeasureAttemptsShownHow it was read
Five-oh-five, left2.53 / 2.52.5 sconsistent
Five-oh-five, right2.45 / 2.462.45 sconsistent
Turn cost, left—0.74 sconsistent
Turn cost, right—0.69 sconsistent

Next step

Book Mateo's retest for the week of Dec 12. Any day that week works.

Book the retestBook at app.apxathletelab.com/home/book, or text or call (858) 899-0098Text usCall (858) 899-0098

The plan we'd suggest: Training. Up to eight athletes, ninety-minute sessions after school, up to one, two, three or four sessions a week. Sprinting, jumping, lifting and agility between the turf and the lab, grouped by ability, not age.

The work happens in APX sessions; there is nothing to do at home.

Studies we compare with

The age comparisons on this page come from these published studies.

  1. CDC growth charts (2000)

    Children and teenagers across the United States.

    Kuczmarski RJ et al. 2000 CDC growth charts for the United States. Vital Health Stat 11(246), 2002. Data files cdc.gov/growthcharts/data/zscore/statage.csv and wtage.csv.

    Matches how we test.

  2. Focke 2013

    Children and teenagers from across Germany, 67 boys his age.

    Focke A, Strutzenberger G, Jekauc D, Worth A, Woll A, Schwameder H. Effects of age, sex and activity level on counter-movement jump performance in children and adolescents. Eur J Sport Sci 2013;13(5):518-526. Table II.

    DOI: 10.1080/17461391.2012.756069

    Matches how we test.

    This range is estimated from the study's average and spread, not counted from its athletes.

  3. Gabel 2016

    Boys and girls from the general population in Vancouver.

    Gabel 2016. J Musculoskelet Neuronal Interact 16(4):283-295. PMID 27973380 (PMC5259569); no DOI.

    Matches how we test.

  4. Kamada 2026

    Boys in one Japanese professional basketball club's youth academy, 27 boys his age.

    Kamada K, Yamashita D, Nishiumi D, Hirose N. Reliability of isometric mid-thigh pull in youth male basketball players across age categories. J Sports Sci Med 2026;25:556-568. Table 2.

    DOI: 10.52082/jssm.2026.556

    A rough match to how we test. A rough reference: a small group of academy basketball players at one club, pulling on different force plates.

    This range is estimated from the study's average and spread, not counted from its athletes.

  5. Mikulič 2025

    Academy soccer boys in Slovakia, 12 boys his age.

    Mikulič 2025, Tables 1 and 2. See doi.

    DOI: 10.3389/fspor.2025.1630522

    Matches how we test.

    This range is estimated from the study's average and spread, not counted from its athletes.

    A small study: treat this as a rough comparison.

  6. Mikulič 2025

    Academy soccer boys in Slovakia, 12 boys his age.

    Mikulič 2025, Table 3. See doi.

    DOI: 10.3389/fspor.2025.1630522

    A rough match to how we test. A rough reference: their sprint started closer to the first gate than ours.

    This range is estimated from the study's average and spread, not counted from its athletes.

    A small study: treat this as a rough comparison.