Why does my 400 hurdler's stride pattern fall apart on the curve hurdles?
A stride pattern that holds over flat hurdles can come apart on a curve for a reason that has nothing to do with fitness.
A 400m hurdler can look completely in rhythm over the first hurdle on the straight and then lose the pattern by the fourth or fifth, right where the track bends. The stride count changes, the lead leg switches without being told to, and the coach's first guess is usually fatigue. Sometimes it is. Often it is the curve itself.
Why a curve changes the job
On a straight hurdle, the body goes over the barrier in a straight line and either leg can lead it cleanly. On a curve, the athlete is already leaning into the bend before they ever leave the ground, and a barrier placed on that bend does not care which leg the athlete would prefer to use. Leading with the inside leg on a curve tends to pull the hips toward the rail; leading with the outside leg tends to carry the athlete wide into the next lane.
- An athlete trained to lead with one leg only has no answer when the curve makes that leg the wrong choice.
- Stride length on the inside of a curve is naturally shorter than on the straight, so a pattern built on flat-track spacing arrives at the hurdle early or late.
- Most 400m hurdles tracks put hurdles 2 through 8 or 9 on the curves, which is most of the race, not an exception to it.
What to check on film
The Film Room's hurdles setting reads trunk dip over the barrier, lead-leg extension, how far the hips rise at the hurdle, and overstride between barriers. Those numbers are still useful on a curve, but they were built reading a straight-on clip, and a curve changes the athlete's angle to the camera hurdle by hurdle. Treat a curve clip as a rougher read than a straight one, and trust the stride count and lead-leg choice from your own eye alongside it.
What a single 2D camera cannot tell you: a true trunk-lean or takeoff-angle number on a curve. The lens sees a flat plane, and an athlete running a bend crosses that plane at a slightly different angle every stride, which bends the numbers along with the runner. Film the curve hurdles for pattern and lead-leg choice, and save the degree readings for a straight one.
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Related
Why does your hurdler take a different number of strides between each hurdle?
The step count between hurdles is a symptom, not the problem, and Film Room's overstride number usually moves before the pattern actually breaks.
Read →Why does my hurdler fade in the back half of the race?
Clean hurdles early and a chopped, slowing stride pattern late is usually fatigue finding the exact technical fault good conditioning was hiding.
Read →Should your 300 hurdler learn to lead with both legs?
Yes, and the time to start was the part of the season where it cost nothing, which is never the week you discover you need it.
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