Scroll down for a behind the scenes journey to locations around the planet
Why is one of the world's poorest countries home to some of the world's best distance runners? View behind the scenes
Did humans lose their runners bodies as they adapted to arctic cold? View behind the scenes
What do some of the world's fastest bodies look like at 200 frames per second? View behind the scenes
Can we still run like our anscestors? View behind the scenes
