Kenya dominates distance running in a way no other country dominates any sport. Since Kipchoge Keino stunned the 1968 Olympics, Kalenjin runners from the Rift Valley have rewritten every record book in existence. This is not genetics alone. It is altitude, cattle-herding childhoods, a school system that rewards runners, and a culture that treats the morning run as sacred. This trail follows the phenomenon from Keino to Kipchoge, from the dirt tracks of Iten to the streets of Berlin, asking why this small corner of East Africa produces the fastest humans on earth.

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