Adharanand Finn had always been a runner. After entering and winning a race in his hometown of Devon, England, Finn decided it was time to train seriously again. The Kenyans, he thought, some of the fastest people in the world, would be the perfect training partners. So, he went to Kenya, to run seriously and to try to unlock the secrets of speed. He writes about the journey in his book "Running with the Kenyans."