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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.
It also boosts blood flow and oxygenation of tissues; helps deliver nutrients to your muscles, and facilitates removal of metabolic waste. As a general rule, warm up first, then stretch. Stretching is particularly important prior to high-intensity sprinting exercises, but is best avoided prior to weight training. Stretching your IT band and ankles is important for preventing knee pain and mobility problems. Sample stretching exercises for both areas are included.