Arnold Schwarzenegger is already the reigning Mr. Olympia when the cameras arrive at Gold's Gym in Venice Beach, and the film follows him defending that title against a cast of rivals training for the same 1975 competitions. Lou Ferrigno gets the most screen time as the challenger, a soft-spoken giant training under his father's watch, hoping raw size can beat Schwarzenegger's showmanship. The camera stays close on the gym floor and backstage at the contests, catching the posing routines, the mind games competitors play on each other, and the diets and rituals that go into building a body for judging. Schwarzenegger narrates his own psychology on camera with total confidence, comparing the pump to other pleasures and treating competition as something closer to combat than sport. The film treats bodybuilding as a serious subculture rather than a curiosity, and it is the reason gyms filled up with a new generation of lifters after its release. Franco Columbu and Mike Katz round out a cast of men chasing the same stage.