I learned so much from this book about the sport of ultrarunning, evolutionary theories about humans and running, the rich history of the Tarahumara, and much more. Christopher McDougall tells a great story of the Tarahumara in Mexico and intertwines that narrative with the experiences of the other runners in the climactic race at the end of the book. This book has inspired me to keep running through the frigid winter months, and is definitely a "must-read" for any runner!