Your data is protected
Working with children's information requires the highest standards. TestMi is built with data protection and safeguarding at its core.
- All data is encrypted when stored and when sent
- You control who can see each athlete's information
- Parents give consent through secure links that expire automatically
- Two-factor authentication keeps accounts secure
“As a parent, knowing that my child's data is handled properly gives me real peace of mind. The consent process was straightforward and I could see exactly what was being collected.”
Magdalena M.
Parent of Athlete
Understand athlete development
See how each athlete compares to others of the same age and gender. Track growth and maturity to support training decisions.
- Compare results to age and gender-matched data
- Monitor biological maturity using established methods
- Track growth rates and predict adult height
- See injury risk indicators based on growth phase
- Group athletes by biological age for fairer competition
“Being able to see the whole squad's growth and maturity status in one view is a game changer. You can spot straight away who's in a growth spurt and may need additional observation or load adjustment — that immediate visibility is invaluable to the athlete's development.”
Jake P.
Lead Strength and Conditioning Coach, Move4Sport
Alex Johnson
14U Tennis · Male
Chrono age
13.4
Bio age
14.1
Maturity
EarlyPredicted height
182 cm
Height velocity
Designed for coaches
Built by people who run youth sport programmes. TestMi fits into your existing workflow, not the other way around.
- Follow test protocols with warm-up cues and rest timers
- Enter data on your phone at the training ground
- Share reports that parents can understand
- Export data to spreadsheets when you need to
- NewOffline data entry — record results without signal, sync when you're back online
“I can enter test data on my phone at the track and the reports are ready to share with parents before I've left the session. It's completely replaced our spreadsheets.”
Gareth S.
Head Coach, Move4Sport
Testing Session
U14 Squad · 15 Feb 2026
Best: 3.41s
Growth Tracker
See your whole squad's growth and maturity status at a glance. Identify which athletes may be at higher injury risk during growth spurts, and group athletes by biological age for fairer training and competition.
- View all athletes in one table with sortable columns
- Injury risk flags based on growth velocity and maturity phase
- Bio-banding view to group athletes by biological age
- Alerts when measurement data becomes stale
Offline Mode
No Wi-Fi at the track? No problem. Record test results and add athletes without an internet connection. Everything syncs automatically when you're back online.
- Add athletes and record test results without any signal
- Data saved securely on your device until connection returns
- Automatic sync when you reconnect — no extra steps
- Works on phones, tablets, and laptops
Offline — recording locally
3 items queued
Back online — all synced
3 items synced successfully
See It in Action
Real charts, real insights — here's what your athlete reports look like inside TestMi.
Jamie Davies
Age 13 · U14 Squad
Interactive preview with sample data
What you can do with TestMi
Run test sessions
Follow protocols with warm-up instructions, rest timers, and automatic recording of multiple attempts.
View clear reports
See results in charts and tables. Compare athletes and squads. Track progress over time.
Support multiple sports
Set up different test types and reference data for each sport. One account for your whole organisation.
Compare to benchmarks
See how athletes compare to others of the same age and gender. Use your own data or standard references.
Growth Tracker
See all athletes' growth and maturity status in one view. Identify injury risk based on growth phase. Group by biological age for bio-banding.
Share with parents
Send reports through secure links. Collect parental consent before storing athlete data.
Developed with
Built alongside the people who use it
TestMi was developed in partnership with Move4Sport, a specialist youth strength & conditioning coaching provider in London. Their coaches — with experience spanning Olympic sport, professional football, elite gymnastics, and international tennis — shaped every feature, from how test sessions flow to how results are presented to parents.
“We needed a tool that worked the way we actually coach — recording data trackside, seeing maturity status at a glance, and sending reports that parents can understand without a sports science degree. TestMi is that tool.”
Move4Sport coaching team
Strength & Conditioning for Youth Athletes