Retired Navy SEAL, Army Ranger, Air Force TACP — the only person in US military history to complete all three programs. Author of the NYT bestselling memoir 'Can't Hurt Me' and sequel 'Never Finished.' Has competed in over 70 ultra-endurance events including Badwater 135 (3x), Moab 240, UTMB, and Ironman World Championship. Known globally for the '40% Rule' — the belief that when your mind says stop, your body still has 60% left to give.