David Goggins is a retired Navy SEAL and the only member of the U.S. Armed Forces ever to complete SEAL training, U.S. Army Ranger School, and Air Force Tactical Air Controller training. Goggins has competed in more than sixty ultra-marathons, triathlons, and ultra-triathlons, setting new course records and regularly placing in the top five. He is a former Guinness World Record holder for completing 4,030 pull-ups in seventeen hours, and inspires tens of thousands each year through his speaking engagements and training. I caught up with David to learn more about his journey, and howe we can build the resilience and endurance he has.