In 2017, Brendan Leonard signed up to run a 100-mile race, despite not being much of a runner. Why? Because his longtime friend and hero, Jayson Sime, convinced him to. And part of him wanted to test out Sime’s life philosophy, which is that you can do anything you dream up, so long as you put in the work and refuse to quit. It had worked so far for Sime, who grew up impoverished, one of six children without a father, and dyslexic. Together, they trained for endless hours, through tedium, exhaustion, joy and gluttony. And when they arrived at the starting line of the race — the notoriously challenging Run Rabbit Run 100 in Steamboat Springs, Colorado — what unfolded was about more than just a crazy dream. It was about one extraordinary friendship.