I'm not a runner but found this story to be a fascinating mix of sports lore, adventure, history, anthropology, and science. The author begins with the question of why it hurts when he runs. Not satisfied with more than one dr. telling him to stop running, he decides to learn more about a tribe of indians in mexico,the tarahumaras, who are known for their ability to run 50 miles and more at a pop and remain injury free. His journey to Mexico leads him to an eccentic loner from Colorado who has made the Copper Canyon his home for the past ten years. Together they plan a race between the tarahumara and a bunch of ultramarathon runners to take place in the Copper canyon. The story zigzags through the runners' own stories toward the climactic race with the Tarahumaras. In between, there is the argument for barefoot running, or less-is-more, really, since the tarahumara run in sandals. There is also some discussion of how the human body is in fact built for long distance running. Lots of crazy antics by the crazy people who live for ultrarunning. They are a different breed.