03/23/2026
Most ACL injuries don’t happen while sprinting.
They happen while stopping.
Deceleration is the most undertrained skill in youth and collegiate athletics — and it’s one of the biggest reasons athletes get hurt.
Here’s what the research tells us:
Braking forces during deceleration can reach up to 5.9x body weight. The knee absorbs a massive share of that load every single time an athlete cuts, stops, or changes direction.
Most training programs build speed and power. Almost none of them train athletes how to absorb force, control landing mechanics, or decelerate under fatigue.
And after ACL surgery? Athletes cleared for return to sport still show reduced force absorption, altered landing patterns, and quad asymmetry. A timeline doesn’t equal readiness. The movement quality has to be there first.
This is exactly why deceleration training is a non-negotiable in every program I build — especially for athletes returning from injury.
📚 Research:
Harper et al. (2024) — Braking Performance Framework. Journal of Sports Sciences.
Gill et al. (2024) — Force Absorption & Return to Sport After ACLR. Arthroscopy: The Journal of Arthroscopic & Related Surgery.