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If that promotes the development of fast-twitch muscle fibres in growing foetuses, that could add to the Jamaican edge. The truth is, we donât have enough information to draw firm conclusions about the Jamaican dominance of sprinting. But there is good reason to dig deeper â and it has nothing to do with athletics. We now have evidence that extreme stress, heat, cold, malnutrition and pollution (including tobacco smoke) trigger changes in the way genes are activated or silenced.
The greater your degree of hip extension, the more work is performed by your glutes and hamstrings--sprinting will build these muscles more than jogging. When you swing your leg forward to take another step you use your hip flexors at the front of your hip and your rectus femoris, one of the quadriceps muscles.