In 1977, the documentary "Pumping Iron" introduced moviegoers to the world of bodybuilding. 

The film showcased the events leading up to the 1975  Mr. Olympia competition, focusing on then 5-time champ Arnold Schwarzenegger and future Hulk Lou Ferrigno. 

A lot has changed since then, as Americans have become more interested in fitness and exercise. But what about bodybuilding?  

"Generation Iron" is a new film from director Vlad Yudin. It follows a new generation of bodybuilders in their quest to be crowned Mr. Olympia. We're joined by the film's director Vlad Yudin.