East Africans especially Kenyans and Ethiopians -- have dominated marathons for decades, dashing across finish lines as their exhausted competitors barely made it. In the process, they've toppled their own records or those of their fellow citizens.

Kenyan marathon runners are such a phenomenon that research organizations have done studies on why they dominate long distance races.

There's so much speculation on why Kenyans and Ethiopians keep crushing marathon competitions, the phenomenon has long been a subject of study.

"The periodic domination of middle and long distance running by different regions of the world is not a new phenomenon," it says. "Researchers are yet to confirm a genetic or physiological advantage in being a middle or long distance runner of East African origin, and it is most likely that the reasons for their success are many."


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