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Why does one small tribe in Kenya - the Kalenjin - produce a statistically impossible percentage of the world's fastest distance runners? According to David Epstein, Senior Editor at Sports Illustrated, "There are 17 American men in history who have run under 2:10 in the marathon, while there were 32 Kalenjin who did it in October of 2011." This one small tribe tends to not only win most competitive marathons, they generally also fill nearly every slot of the top 10 finishers.

Source : https://www.inc.com/josh-linkner/what-kenyan-distance-runners-can-teach-us-about-achievement.html

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