Mike Wolfe and Hal Koerner are both experienced world class UltraMarathoners as well as soon to be dads. Follow their grueling trials and tribulations as they set out on their most challenging event to date, in their attempt at the Fastest Known Time running the John Muir Trail. With 223 miles of rugged mountain trails in the Sierra Nevada Mountain Range, and 80,000 feet of elevation change. The film will explore not only the physical toll, but the mental toll of running for nearly 4 days straight. Learn the storied history of this grueling feat and the ever evolving record as it continues to be pushed. See the beauty, purity and ruggedness of the Sierra Nevada Mountains through their eyes and the elation they feel when the complete this momentous task.