Why are the East Africans so great?

Well, I'll expand it and ask, Why are the most of the greatest athletes in the most popular sports from humble poorer backgrounds? It's all about humble beginnings which build fire, desire, hunger, effort and fight:

http://www.youtube.com/user/chrysler?blend=1&ob=5#p/c/0/7O6q3_GA47w.

How hungry are you? How willing are you go fight through the pain when that wall hits?

Tough questions for each of us to answer.

Harry