The World's Toughest Endurance Challenges

The World’s Toughest Endurance Challenges profiles 50 of the most extreme marathons, triathlons, bike rides, adventure races, climbs, open-water swims and other iconic endurance events from around the world. Breathtaking full-color photographs and insider commentary from top athletes will thrill endurance athletes, extreme sports addicts, and outdoor adventurers of all stripes.
 
Across the world seemingly ordinary people are undertaking extraordinary challenges that will push th…