 Follows extreme ultrarunner David Horton through the desert sun, the high snowbound mountain passes, the pain, the emotion, and his revelation. Join him as he runs more than 40 miles per day for 66 consecutive days in an attempt to set the speed record on the 2,700 mile Pacific Crest Trail from Mexico to Canada. Follows Horton s journey and discovers who he really is through interviews with today s best endurance athletes, Horton s family, and Horton himself. What drives him to such extreme challenges? What does it take to become THE RUNNER?