Read the mechanics.
A pose-estimation model runs live in your browser to grade jump mechanics — eccentric load depth, hip and knee angles, and the inward knee collapse that wrecks ACLs. The camera feed never leaves this device.
Stand side-on for load depth, face-on for valgus.
What the numbers mean
Knee & hip angle — the interior joint angles during your eccentric Loading Phase. Deeper flexion (smaller angle, down toward ~95°) stores more elastic energy for the drive up. Too shallow and you leave height on the floor.
Valgus index — the width between your knees divided by the width between your ankles in the frontal plane. Around 1.0 is safe; the knees track over the toes. When it drops below 0.62 the knees are buckling inward — the camera flashes a red structural-risk alert and rings the collapsing knee.
Nothing is uploaded. The webcam frames are analysed on this device and discarded; only derived angles ever reach the screen.
- Place the phone/laptop ~2.5 m away so your whole body is in frame.
- Press Start tracking and grant camera access.
- Load and jump — watch the phase flip to Loading Phase, then Landing.
- On landing, keep the valgus index high and the banner dark.