The research
The angle. The range. The study.
Each check shows the angle it measured, the range it should sit in, and the study that set that range. Nothing is scored against a number we made up.
| Check | Phase | Target range | Study | Result |
|---|---|---|---|---|
| Sprint · front knee | Set | 85 to 100° | Bezodis et al. 2015 | Optimal |
| Sprint · rear knee | Set | 115 to 135° | Slawinski et al. 2010 | Optimal |
| Sprint · front hip | Set | 40 to 60° | Bezodis et al. 2019 | Optimal |
| Sprint · trunk lean | Drive | sport-specific | Slawinski et al. 2010 | Close |
| Sprint · trunk angle | Set | 15 to 40° | Harland & Steele 1997 | Close |
| Basketball · release | Release | phase-specific | Okubo & Hubbard 2006 | Optimal |
| Football · contact body level | Contact | contact range | Hendricks et al. 2015 | Optimal |
| Football · head position | Contact | contact range | Tierney et al. 2018 | Optimal |
| Football · drive direction | Drive & Wrap | drive range | Tierney et al. 2018 | Close |
Why a range, not a single number.
Bodies differ. A published range is a band you should land inside, not one exact number to hit. PRFCT Form shows where you landed and flags anything outside.
Optimal
Inside the published range for that phase.
Close
Just outside the range, or read from a frame with lower confidence.
Needs work
Outside the range. You see the number and how far off it is.
See what your next rep looks like.
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