" Everyone thinks they know how to run, but it’s really as nuanced as any other activity,” Eric told me. “Ask most people and they’ll say, ‘People just run the way they run.’ That’s ridiculous. Does everyone just swim the way they swim?” For every other sport, lessons are fundamental; you don’t go out and start slashing away with a golf club or sliding down a mountain on skis until someone takes you through the steps and teaches you proper form. If not, inefficiency is guaranteed and injury is inevitable. "

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