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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.
1 Running as fast as you can for a short period of time builds up your muscles and helps you gain endurance. 2  Mix up your long running sessions with sprinting days. 3  Use a stopwatch to time yourself. 4  Start by sprinting as fast as you can for a quarter mile; do this 4-6 times.