Apayauq Reitan attempts to become the first out transgender woman to complete the legendary thousand-mile Iditarod sled dog race.

Warren Sapp, a Pro Football Hall of Famer and Super Bowl champion, battles a fatal brain disease known as CTE.

Canadian polo players prepare for the Tokyo Games, a path barely trodden by the national team athletes that came before them.

Follows the soccer team at Margaret Long Wisdom High School in Houston, TX, made up of 24 players from 12 different countries.

Chronicles the remarkable decades-long journey of a legendary basketball tournament in Harlem.

Black NASCAR driver Rajah Caruth forges an unlikely path from virtual racing to the sport's penultimate series.