Writing from both the cutting edge of scientific discovery and the front-lines of elite athletic performance, National Magazine Award-winning science journalist Alex Hutchinson presents a revolutionary account of the dynamic and controversial new science of endurance.

An endurance athlete and coach reveals how the marathon transforms the lives of everyone who attempts it - and how it has helped his own family cope with serious adversity.

Isolated by Mexico's deadly Copper Canyons, the blissful Tarahumara Indians have honed the ability to run hundreds of miles without rest or injury. In a riveting narrative, award-winning journalist and often-injured runner Christopher McDougall sets out to discover their secrets. In the process, he takes his audience from science labs at Harvard to the sun-baked valleys and freezing peaks across North America, where ever-growing numbers of ultra-runners are pushing their bodies to the limit.

New York Times best-selling author and ultramarathoning legend Dean Karnazes has pushed his body and mind to inconceivable limits, from running in the shoe-melting heat of Death Valley to the lung-freezing cold of the South Pole. He’s raced and competed across the globe and once ran 50 marathons, in 50 states, in 50 consecutive days.

In 80/20 Running, respected running and fitness expert Matt Fitzgerald introduced his revolutionary training program and explained why doing 80 percent of runs at a lower intensity and just 20 percent at a higher intensity is the best way for runners at all levels - as well as cyclists, triathletes, and even weight-loss seekers - to improve their performance. Now, in this eye-opening follow-up, Fitzgerald teams with Olympic coach Ben Rosario to expand and update the 80/20 program to include ultramarathon training and such popular developments as the use of power meters.