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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.
But should you sprint straight to the squat rack every damn day? Not so fast. How Much Is Too Much Strength Training? Strength training and its benefits are all about balancing stress and recovery. Every time you perform a strength exercise, you create microscopic tears in the muscles youâve worked. So when you take some time off from working that muscle, its fibers are able to repair themselves and come back stronger than they were before, explains Tennessee-based personal trainer and strength coach Hannah Davis, C.S.C.S.