New York Times bestselling author and ultramarathoning legend 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 extraordinary adventures leading up to his return to the Western...