That’s not to say it’s unenjoyable. Kai Greene, the sport’s philosopher king, is as fascinating, mysterious, and quotable as ever as he tries to find meaning in a life that no longer revolves around Mr. Olympia. Rich Piana lives up to his reputation as a dark horse (or is it black sheep?) of the sport, at one point confessing that he finds little meaning in family and that his biggest goal is to be as popular as Dwayne Johnson — so that everyone will want to wait on him. Iris Kyle shows a lot of pathos as she grapples with the reality that Ms. Olympia has been discontinued and that female bodybuilding is largely extinct, subverted by figure and bikini competitions. Social media celebrity Calum von Moger, meanwhile, proves that despite his farm boy niceness and mammoth Instagram following, he really doesn’t have the on-screen charisma to meet his movie star aspirations.