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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.
Thirty-second hill sprints can help to improve your anaerobic capacity (Pic: Forest of Dean Sportive) Training session two â 3Ã3 minutes In this session you need to pace the effort so that at the end of the three minutes you are completely empty, rather than running out of steam too early.