Aisha McAdams, a former competitive runner turned photographer, embarks on a journey to document the triumphs and struggles of famed ultra trailrunners, including Jim Walmsley and Eszter Csillag. Traveling to mythical races-the Western States Endurance Run in the mountains of eastern California, the Ultra-Trail du Mont-Blanc in the French Alps-the film marvels at athletes who maintain their intensity as they run 100 miles of mountain trails while climbing thousands of vertical feet.