Months before the 1975 Mr. Olympia contest, filmmakers George Butler and Robert Fiore persuaded Schwarzenegger to compete, in order to film his training in the bodybuilding documentary called <answer>Pumping Iron</answer>. Schwarzenegger had only three months to prepare for the competition, after losing significant weight to appear in the film Stay Hungry with Jeff Bridges. Lou Ferrigno proved not to be a threat, and a lighter-than-usual Schwarzenegger convincingly won the 1975 Mr. Olympia.
What was the name of the bodybuilding film Schwarzenegger starred in?
Pumping Iron