In February 2008, Bill Walton, after climbing to the top of every mountain he ever tried, suffered a catastrophic spinal collapse--the culmination of a lifetime of injuries--that left him in excruciating, debilitating, and unrelenting pain. Unable to walk, he underwent pioneering surgery and slowly recovered. The ordeal tested Walton to the fullest, but with extraordinary determination and sacrifice, he recovered. Now Bill Walton shares his life story...