After finishing this book, you will find it hard to not go out and run ten miles in Rock Creek. McDougall makes the case that humans evolved to be long distance runners, as our ancestors hunted exhausted prey on the fields of Africa. And that leads to the argument that humans have been running for thousands of years without injuries wearing only sandals or nothing at all. It is only with the rise of Nike that knee injuries became common. One of the top books about endurance running ever written, McDougall takes us on a wild ride through the sport, from the mountain trails of Colorado, to labs in Harvard, finally to the isolated Tarahumara tribe in Mexico’s Copper Canyon, and the race of a lifetime.