You can't feel left-right strength imbalances until it's too late. A 15% deficit on one side drastically increases tear risk during high-speed sprinting.
Most injuries happen when the muscle lengthens (eccentric phase). If you can't control the descent, you can't control the deceleration of your leg swing.
The Nordic Hamstring Curl is the gold standard for eccentric strength. But simply "doing them" isn't enough. You need to know:
SpeedTrackr AI answers these questions in seconds.
No expensive force plates or dynamometers needed. Just upload a video.
Measure the exact velocity of your descent. Slower descent indicates better eccentric control, a key factor in injury prevention.
Identify imbalances between your left and right hamstrings. Asymmetries >10% significantly increase injury risk.
Determine the precise knee angle where you lose eccentric control, helping you track range-of-motion improvements.
Log your Nordic curls over time to visualize strength gains and ensure your injury prevention program is working.
Multiple systematic reviews have confirmed that including the Nordic Hamstring Exercise (NHE) in injury prevention programs reduces hamstring injury rates by up to 51%.