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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.
Races run at 100 percent of your maximum effort accomplish this goal quite well, as do sprints or maximum-weight lifts in the gym. Make sure you run at least one hard workout per week, and race regularly. A favorite to burn a lot of calories is to run a Warrior Dash. The combination of running and obstacles keeps your heart rate high and boosts the amount of energy you continue to burn after you finish. More: 10 Exercises to Get You Ready for an Obstacle Coure Race.