By itself, any of the 4 Deserts races would be one of the longest ultramarathons in the world. Put together, the four events make up a series that challenges even the most elite long-distance

Every year in the heart of winter, runners, bikers, and skiers challenge themselves to cross 135 miles of terrain in the remote woods of northern Minnesota. This title introduces readers to…

Every summer, runners gather in California's Death Valley to begin a race that covers 135 miles in searing heat. After beginning at one of the lowest points in the United States, competitors…

Since the late 1970s, motorcyclists and auto racers have gathered to test themselves over thousands of miles of some of the harshest deserts on Earth. What began as a race from Paris, France,

Faced with one of the toughest winter environments in the world, competitors in the Iditarod Trail Invitational need to have what it takes to survive the brutal conditions of the frozen…

With three grueling events combined into one energy-draining test of endurance, an Ironman triathlon pushes some of the top swimmers, runners, and bicyclists to their physical limits. This…

The best mountain bikers on earth gather in Alberta, Canada, every summer to begin one of the biggest challenges their sport has to offer. This title introduces readers to a 2,745-mile…

For two decades, racers have gathered in southeastern France to begin a demanding footrace that takes them through three countries. Along the way, they have to conquer the tricky terrain of…