Why does my sprinter's form look clean but their times aren't dropping?
Good technique numbers and no improvement usually means the limiter isn't technique at all.
A sprinter whose trunk lean, elbow angle and overstride all sit inside the normal range, whose cadence is fine, and whose times have not moved in two months, is not an unusual case. It is confusing because everything a coach normally checks looks right, and the natural next move, tightening the technique further, often does nothing.
What film actually measures
A film-based check reports the shape of the stride: trunk lean, elbow angle, how far the foot lands ahead of the hips, ground contact and flight time, cadence, and the resulting top speed once two marks a known distance apart are set. All of that is real and worth tracking. None of it measures the force behind the stride.
Two sprinters can produce identical ground contact times and identical overstride numbers while one of them is pushing against the ground with considerably more force than the other. The camera sees the shape and the timing. It does not see the push that made the shape happen.
What's usually actually missing
- Strength and power, particularly in the posterior chain, which technique drills alone don't build.
- Rate of force development: not how strong the athlete is, but how quickly they can apply it, which is a different quality than maximum strength.
- Recovery between sprint sessions, since nervous-system fatigue can hold speed flat even while technique and strength both look fine.
Clean technique with no speed gain over weeks of training is usually a sign to look outside the stride itself: at the weight room, at jump testing, at whether the athlete is actually recovering between the sessions meant to make them faster. Technique work has a ceiling. Past it, the limiter is almost always what the muscle can produce, not what the form looks like while it produces it.
What a single 2D camera cannot tell you: how hard the ground was pushed on. It can time the contact and measure the angle. It cannot weigh the force, and two athletes who look the same on film can be nowhere near the same underneath it.
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Related
How do you coach a thrower whose Film Room numbers look fine but the throw still comes up short?
Clean technique on film and a short throw are not a contradiction. It usually means the next few feet live somewhere the camera cannot see.
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