Pumping Iron is a documentary film released in 1977 that explores the world of bodybuilding, focusing on the 1975 Mr. Olympia and Mr. Universe competitions. The movie follows Arnold Schwarzenegger as he defends his title against Lou Ferrigno, and showcases the struggles and triumphs of amateur and professional bodybuilders preparing for the competition. The film had a significant impact on society, transforming bodybuilding from a sideshow to a competitive sport and creating a multi-billion dollar market for equipment, trainers, and gyms.