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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.
Next, start off slow ... get the body used to a slow jog, then gâ¦radually build up speed which also increases endurance. In no time at all you will be at the sprint speed you so desire. also the reason some people might be faster at running is because they had been more active.