![_76358038_thighs[1]](https://cdn-the5krunner-com.r.worldssl.net/wp-content/uploads/2014/07/76358038_thighs1.jpg)
Sprinters Andrew Greipel (left) and Robert Foerstermann in 2012 (Source: Greg Henderson)
Also read this article from the BBC http://www.bbc.co.uk/news/magazine-28363129 you need a bit more power in those legs.
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