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 battle a scoring desert sun as they climb 8,300 feet (2,530 m) to finish at Mt. Whitney. This title introduces readers to an ultramarathon that event organizers call the "World's Toughest Footrace." The title features informative sidebars, exciting photos, a map, a glossary, and an index. SportsZone is an imprint of Abdo Publishing, a division of ABDO.