Best friends Matt Galland, Danny Bryson and Blake Josephson are adventure enthusiasts who take on the unthinkable challenge: to run 100 miles in just four days through Utah's rugged backcountry wilderness. The guys think of the Wasatch Mountains as their own backyard and are all too aware of the dangers this harsh environment has to offer. They must scale jagged cliffs, dodge tumbling boulders and find a way back down from the snowy summits they ascend…all while they try to avoid bears and mountain lions. The trio’s physical and mental endurance is put to the test. Can these three best friends really overcome these obstacles and run four grueling marathons in just as many days?