In the dusty hills above San Diego, Bob Larsen became America's greatest running coach. Starting with a ragtag group of high school cross country and track runners, Larsen set out on a decades-long quest to find the secret of running impossibly fast, for longer distances than anyone thought possible. Himself a former farm boy who fell into his track career by accident, Larsen worked through coaching high school, junior college, and college, coaxing talented runners away from more traditional sports as the running craze was in its infancy in the 60's and 70's. On the arid trails and windy roads of California, Larsen relentlessly sought the 'secret sauce' of speed and endurance that would catapult American running onto the national stage.