Unbreakable: The Western States 100 (2012)

The 2010 Western States 100 brought Geoff Roes, Anton Krupicka, Kilian Jornet and Hal Koerner to the same start line, and JB Benna's film follows all four across 100 miles of California mountain trail. It plays like a sports thriller, with a real head-to-head over the final miles and about six minutes in it at the finish. If one film explains why trail runners talk about this race with reverence, it is this one, and it still works for viewers who have never heard any of the names.