A Runner's High

Dean Karnazes is a two-time New York Times bestselling author and an icon in the running world. TIME magazine named Karnazes one of the '100 Most Influential People in the World.' An internationally acclaimed endurance athlete, he is the winner of an ESPN ESPY, a three-time winner of Competitor magazine's Endurance Sports Athlete of the Year award and the recipient of the President's Council on Sp...