Watch Marathon (2021) HD Full Movie Free on solarmovie.do. Watch Marathon (2021) online free. An unprofessional documentary film crew follows five amateur runners as they train for Devil's Canyo...An unprofessional documentary film crew follows five amateur runners as they train for Devil's Canyon Marathon, an offbeat desert race organized by Ed Clap, a desperate shoe store owner pulling out all the stops to celebrate its fifteenth year.