all terrain bicycling

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 title introduces readers to a series of races that grew from a humble beginning in Hawaii in the 1970s to a global race series that captures the imagination of fans worldwide. The title features informative sidebars, exciting photos, a map, a glossary, and an index.

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 Alaskan wilderness. This title introduces readers to a race that follows the same path as the famous Iditarod Trail Sled Dog Race, but instead features human competitors trying to make it through this month-long test on their feet, bikes, or skis. The title features informative sidebars, exciting photos, a map, a glossary, and an index.

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 one of the coldest ultramarathons on the planet, a race that begins in the "Icebox of the Nation" and only gets tougher from there. The title features informative sidebars, exciting photos, a map, a glossary, and an index.