Quite, and sociocultural influences are why long distance running is dominated by East Africans and to an even more absurd degree by the Kalenjin, an ethnic gro

Quite, and sociocultural influences are why long distance running is dominated by East Africans and to an even more absurd degree by the Kalenjin, an ethnic group of less than five million people who take more than a third of top three places in competitive marathon running worldwide. Sociocultural influences are also obviously why there have been at most two men not primarily of West African ancestry who ran 100m in under 10s, and almost 70 men of that ancestry who did. Sociocultural influences must also be why the Dutch are the tallest people in the world. They really, really want to be tall and that explains their height.