APX Athlete Lab
Book a Baseline

About APX

Pro-level testing.
For every athlete.

Pro teams stopped guessing years ago. They test force, speed, and movement quality, and they train against those numbers. That technology used to be locked inside elite facilities. APX brings it to your athlete: a sports science and performance training facility in El Cajon, serving San Diego County, built around the VALD testing system, the same platform used by teams in the NFL, NBA, MLB, NHL, and Premier League. Every plan we build starts with measurements, not guesswork.

Book a Baseline Assessment $199 · about 45 minutes · no sign-up fee ↗

Used by teams in

  • NFL
  • NBA
  • MLB
  • NHL
  • Premier League
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Who it's for

Built for your athlete.

Ages 8 and up

From first-year youth players building habits to varsity athletes and adults chasing a comeback season.

Every sport

Force, speed, and movement quality matter whether they play soccer, softball, or football. The Baseline is the same for everyone; a sport add-on adds tests for how your athlete plays.

Every level

No tryout, no minimum. A Baseline Assessment shows where your athlete stands today and what to work on next.

How we work

Four rules we don't break.

01
Measure before you train

A Baseline Assessment before any plan, and a retest after. No program starts on a guess.

02
Report to the parent

Every result in plain language, in a private report, reviewed with a coach. You see everything your athlete sees.

03
Compare athletes with themselves

Left against right and this test against the last, never against a chart of other kids, and a number only counts when it held up across repeat tries.

04
Coach every rep

Small groups and certified, background-checked coaches, so the numbers turn into better movement, not just more work.

Methodology

How we read the numbers.

A number is only useful if you can trust it. Every result in your athlete's report passes the same written rules, and every rule traces back to published sports science. Here is how a test becomes a result.

  1. 01

    Same tests, same order

    Every Baseline runs the same tests in the same order with the same number of tries, so this session lines up with the next one. Athletes under 12 run a shorter set of about 22 minutes.

  2. 02

    Repeat tries must agree

    Each test is repeated three to five times. A result counts only when the tries agree more closely than the difference it claims. A left-right gap measured as 8, 12, and 16 percent is not a finding; it is three numbers that disagree.

  3. 03

    Compared with themselves

    Left against right, a jump with a dip against a jump from a still start, and this test against the last. No age charts or percentiles: between about 11 and 16, most of these numbers move with maturity more than with training.

  4. 04

    Maturity on record

    Age, height, and sitting height give an estimate of where your athlete is on their growth curve. It sets a training bracket, never a score, because the estimate carries about a year of error either way.

  5. 05

    Landing check first

    The hardest landing tests wait until your athlete passes a two-minute landing check with a coach: a quiet landing, knees over toes, and a still hold. A test that waits is a next step in the report, never a fail.

  6. 06

    Rules set the facts, a coach signs off

    Software turns every test into numbers and flags using fixed rules. The written notes are drafted from those numbers and checked against them, and a coach reads every report before you see it.

What a report will never say.

Risk scores
No test in the Baseline can forecast an injury, so no report gives your athlete a risk number.
Rankings
Athletes are never ranked against each other, and results are never used for team selection or tryouts.
Borrowed cut-offs
Many published pass marks come from adult pros or from patients after surgery. We cite those studies for what they measure, never for a pass mark set on someone else.
Recruiting talk
Nobody under 15 hears about specializing in one sport or getting recruited, whatever their numbers.
Diagnoses
We measure movement. Pain or a suspected injury goes to a licensed health care provider, not to a test.

The research behind the rules.

  • Repeat tries must agree Hopkins WG. Measures of reliability in sports medicine and science. Sports Med, 2000. DOI ↗
  • Left-right differences Exell TA, et al. Implications of intra-limb variability on asymmetry analyses. J Sports Sci, 2012. DOI ↗
  • No universal asymmetry cut-off Bishop C, Turner A, Read P. Effects of inter-limb asymmetries on physical and sports performance. J Sports Sci, 2018. DOI ↗
  • Maturity and performance Philippaerts RM, et al. The relationship between peak height velocity and physical performance in youth soccer players. J Sports Sci, 2006. DOI ↗
  • Maturity estimate Moore SA, et al. Enhancing a somatic maturity prediction model. Med Sci Sports Exerc, 2015. DOI ↗
  • Landing check Padua DA, et al. The Landing Error Scoring System (LESS). Am J Sports Med, 2009. DOI ↗
  • Jump monitoring Claudino JG, et al. The countermovement jump to monitor neuromuscular status: a meta-analysis. J Sci Med Sport, 2017. DOI ↗
  • Youth training Lloyd RS, et al. Position statement on youth resistance training: the 2014 International Consensus. Br J Sports Med, 2014. DOI ↗

Safety and compliance

Certified. Screened. Trained.

Your athlete works with adults you can trust. California's AB 506 sets the floor for any organization that works with minors, and every APX coach clears it before stepping on the floor. Every coach also holds a nationally accredited credential and stays current on the training that keeps young athletes safe.

Certified coaches

Every coach holds a nationally accredited strength and conditioning credential, such as the NSCA's Certified Strength and Conditioning Specialist (CSCS), current CPR and First Aid certification, and sudden cardiac arrest certification.

Live Scan background checks

Every coach, staff member, and regular volunteer clears a fingerprint-based Live Scan background check through the California Department of Justice and the FBI before working with athletes, with ongoing notification of any subsequent arrest.

Concussion and heat illness trained

Every coach completes concussion and heat illness training. An athlete with a suspected head injury is removed from activity that day and returns only with written clearance from a licensed health care provider, followed by a graduated progression of no fewer than seven days.

APX does not diagnose, treat, or provide medical clearance. Questions about our safeguarding policies or a coach's credentials? Call (858) 899-0098 and ask.

The lab

Founded 2026. Open by appointment.

  • Where165 Denny Way, El Cajon, CA 92020
  • HoursBy appointment
  • Baseline Assessment$199 · about 45 minutes
  • ServingSan Diego County
  • Call(858) 899-0098

Get started

Pro-level testing, for your athlete.

Baseline Assessment $199 · Retest $149 · No sign-up fees

Leave your email and a coach will email you to schedule. Or call (858) 899-0098.