The Kalenjin are .06% of the world's population but they are a unique tribe.

They are one of the most dominant athletes in the world.

Example Stats:

5 American High School runners have broken 4 min mile in all time.

One high school in Betin, Kenya has 4 high schoolers who broke a 4 min mile in the same year.

There are 17 men in US history who have run under 2:10 in a marathon.

32 Kalenjin men did this in one year. So why does this specific group of Kenyan men perform so well in distance running?