How do Jamaicans do it? It’s not because of genetics, as some claim. A vast majority of Jamaicans’ ancestors are from West Africa, which has relatively few outstanding sprinters. Nor can genetics explain why Jamaicans outperform other blacks in the Americas, especially in Brazil, which has 36 times as many of them.
http://www.nytimes.com/2016/08/14/op...s-runners.html
http://www.nytimes.com/2016/08/14/op...s-runners.html
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