from Sports Illustrated:

A friend just shared this with me.  I thought it was interesting.

 

    Salazar ticks off the ironic circumstances that seem to cast the U.S. as a Third World country in distance running: "As big as we are, we have fewer people to draw on. In Kenya there are probably a million schoolboys 10 to 17 years old who run 10 to 12 miles a day.  . . The average Kenyan 18-year-old has run 15,000 to 18,000 more miles in his life than the average American--and a lot of that's at altitude. They're motivated because running is a way out. Plus they don't have a lot of other sports for kids to be drawn into.  numbers are what this is all about. In Kenya there are maybe 100 runners who have hit 2:11 in the marathon--and in the U.S. maybe five. . . "

    With those figures, coaches in Kenya can train their athletes to the outer limits of endurance--up to 150 miles a week--without worrying that their pool of talent will be meaningfully depleted. Even if four out of every five runners break down, the fifth will convert that training into performance...