Born to Run: A Hidden Tribe, Superathletes, and the Greatest Race the World Has Never Seen
I absolutely loved this book. Forget about the barefoot debate, and the vegetarian/vegan athlete debate, and the how many miles are good for you debate. This is just one hell of a great story with the most lovable cast of characters. Jurek's reaction after the final race brought honest-to-god tears to my eyes.