Sport - 7 free documentaries about sporting legends.
Start with From Homeless to Pro-Skater: Chad Muska (43 min, VICE), then Death Defying Skateboarding: The Untold Arto Saari Story (51 min, VICE). All 7 documentaries here are free to watch from their makers' official uploads. To read deeper, the top-rated book on sporting legends is Open by Andre Agassi.