Hypothesis

I think that the culture and style of Kenyan running is based on necessity, and that this has lead to Kenyan dominance of long-distance running.  I think that young people in Kenya may be motivated to run professionally in order to have a better future for themselves and for their families.  This incentive combined with Kenya's history of running is what I believe has caused Kenyans to have such a large presence in long-distance running.  Other factors involved may be food and elevation.