A Runner's High

Dean Karnazes has pushed his body and mind to inconceivable limits, from running in the shoe-melting heat of Death Valley to the lung-freezing cold of the South Pole. He's raced and competed across the globe and once ran 50 marathons, in 50 states, in 50 consecutive days. In A Runner's High, Karnazes chronicles his return to the Western States 100-Mile Endurance Run in his mid-fifties after firs...