"It was 23 months after his accident and Peter was still dealing with constant excruciating pain. He'd seen dozens of doctors and tried a myriad of medications, but nothing seemed to work. Faced with the impossible choice of suffering through the rest of his life, he had an unlikely epiphany: "If I could somehow hike 2,000 miles on the Appalachian Trail, then my leg will have to be better." He set a starting date three weeks out, cobbled together...