Featuring world famous natural bodybuilder, Mike O'Hearn, Generation Iron 4 explores the inner workings of professional natural bodybuilding in attempt to expose the truth behind the all natural claim of the sport. With medicine continuing to change at a rapid pace, natural bodybuilding as a whole has been criticized and questioned. Can the league guarantee that competitors are truly natural?
IMDb 5.8/1020201 h 47 min 
