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Running fast is not the same as sprinting. A lot of training lives in the gray zone. 70…80…90 percent effort. Volume builds. Athletes feel prepared. But sprinting doesn’t scale up gradually. The biomechanics change abruptly as athletes approach maximal velocity. Hamstring force increases dramatically. Muscle tendon lengths approach their limits. Coordination patterns shift to handle the rapid braking of the swing limb. If athletes never experience those conditions in training, the tissue and ner
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