Documentarian Vlad Yudin's Generation Iron is an engrossing trip into the world of international bodybuilding. He follows a half dozen world-class competitors as they prepare for the 2012 Mr. Olympia contest in Las Vegas. Yudin devotes most of the film's 100 minutes to the rivalry between the arrogant though affable title holder Phil Heath and the reflective zen master Kai Greene. Though both men are finely sculpted behemoths, they come from starkly different backgrounds and take starkly different approaches to their quests. Yudin plumbs the depths of bodybuilder culture, it's obsessions and excesses in this fascinating film. Recommended.