Flagstaff, AZ – Eight years ago writer Christopher McDougall asked his doctor a simple question how come my foot hurts? Those five words led McDougall on an epic journey to find the world's greatest distance runners. Along the way McDougal becomes not just a journalist but a runner in one of the greatest races the world would never see: pitting America's best ultramarathoners against the legendary endurance of the Tara-oo-mara Indians, hidden in the Copper canyons of northern Mexico. Christoper McDougall's new book documenting his quest is called Born to Run, and he joins me now. Thanks for being with us today.