"Each new page [is] more spellbinding than the one before--this is surely one of the most interesting books I've ever read."--Elizabeth Marshall Thomas, author of The Hidden Life of Dogs

When Bernd Heinrich decided to write a memoir of his ultramarathon running experience he realized that the preparation for the race was as important, if not more so, than the race itself. Considering the physiology and motivation of running from a scientific point of view, he wondered what he could learn from other animals.

In Why We Run, Heinrich considers the flight endurance of birds, the antelope's running prowess and limitations, and the ultra-endurance of camels to understand how human physiology can or cannot replicate these adaptations. With his characteristic blend of scientific inquiry and philosophical musings, Heinrich offers an original and provocative work combining the rigors of science with the passion of running.

In Why We Run, biologist, award-winning nature writer, and ultramarathoner Bernd Heinrich explores a new perspective on human evolution by examining the phenomenon of ultraendurance and makes surprising discoveries about the physical, spiritual -- and primal -- drive to win. At once lyrical and scientific, Why We Run shows Heinrich's signature blend of biology, anthropology, psychology, and philosophy, infused with his passion to discover how and why we can achieve superhuman abilities.