New York Times Bestseller Over 3 million copies sold For David Goggins , c hildhood was a nightmare -- poverty, prejudice, and physical abuse colored his d ays and haunted his nights. But through self-discipline, mental toughness, and h ard work, Goggins transformed himself from a depressed, overweight young man wit h no future into a U.S. Armed Forces icon and one of the world's top endurance a thletes. The only man in history to complete elite training as a Navy SEAL, Army Ranger, and Air Force Tactical Air Controller, he went on to set records in num erous endurance events, inspiring Outside magazine to name him ""The Fittest (Rea l) Man in America."" In Can't Hurt Me , he shares his astonishing life story a nd reveals that most of us tap into only 40% of our capabilities. Goggins calls this The 40% Rule, and his story illuminates a path that anyone can follow to pu sh past pain, demolish fear, and reach their full potential.