Even if you're not a cycling fan, it's hard not to marvel at the amazing physical prowess of the Tour de France finalists. This sunday, 29 July, they will cross the finishing the Champs Elysees in Paris, having cycled 3553 kilometres in just 23 days. They will have chimbed mountain passes more than 2000 metres highand averaged aspeed of around 40 kilometresrnper hour.rnTour de France cyclists aren't the only people to have performed feats that seem superhuman to the rest of us. Last year, for example, Dean Karnazes(left), a 44-year-old ultramarathon runner from San Francisco, ran 50 marathons in 50 US states in50 consecutive days, before running half the way home,from New York to St Louis, Missouri. In May, German freediver Tom Sietas set a new world record by holding his breath underwater for 9 minutes and 8 seconds. How do they do it?
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