Of Kenya’s 31 medals, 23 have been won by track and field athletes, nearly all born in the Great Rift Valley. As these Olympics approach, Kenya is poised again with medal contenders in every men ...

So, my athletes live in Iten, but train down the valley at Tambach Teachers' College, which is at low altitude." Iten lies at 8,000 feet (2,400m) above sea level.