The Tarahumara, one of North America's oldest surviving aboriginal groups, call themselves Rar muri, meaning "nimble feet"--and though they live in relative isolation in Chihuahua, Mexico, their agility in long-distance running is famous worldwide. Tarahumara Medicine is the first in-depth look into the culture that sustains the "great runners." Having spent a decade in Tarahumara communities, initially as a medical student and eventually...