The mind-boggling adventures of his nonstop treks through the hell of Death Valley, the incomprehensible frigidity of the South Pole, and the breathtaking beauty of the mountains and canyons of the Sierra Nevada, Dean Karnazes captures the euphoria and out-of-body highs of these adventures.

With an insight and candor rarely seen in sports memoirs, he also reveals how he merges the solitary, manic, self-absorbed life of hard-core ultrarunning with a full-time job, a wife, and two children, and how running has made him who he is today: a man with an überjock’s body, a teenager’s energy, and a champion’s wisdom.