Rio Olympics 2016: Science behind Usain Bolt's 100m win
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Usain Bolt is the fastest man on the planet and picked up his seventh Olympic gold medal with victory in the 100m in Rio - but what happens when he puts his body through the race? Professor John Brewer on BBC Radio 4 explains the phases of the sprint and the effects it has on the athlete's body.
To relive the historic 100m final, click here.
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