" When he zoomed in, he was startled by what he found: instead of each foot clomping down as it would in a shoe, it behaved like an animal with a mind of its own—stretching, grasping, seeking the ground with splayed toes, gliding in for a landing like a lake-bound swan. "

― Christopher McDougall , Born to Run: A Hidden Tribe, Superathletes, and the Greatest Race the World Has Never Seen