What does it take to finish a 103-mile ultramarathon? Jayson Sime grew up in Iowa in a broken home, one of six children raised by a single mother. He was bullied in school because of his dyslexia, learned to fight, and then learned to wrestle, losing every single match for two years before he finally won one. His fighting spirit carried him through a career as a political organizer, from knocking on doors for a political party to managing U.S. congressional campaigns. In 2017, he entered his first 100-mile mountain ultramarathon. How to Run 100 Miles follows Jayson’s story from overlooked kid to ultrarunner battling his way up Colorado mountain trails.