Pumping Iron (1977)
Dirs. George Butler + Robert Fiore
A documentary's success is appreciable when it not only pleases its target audience but also holds the attention of a viewer who ordinarily has zero interest in the topic onto which it turns its lens.
Such it is with me and body building, a sport / discipline that I care nothing for. But the spotlight cast on the lifestyle by film-makers George Butler and Robert Fiore makes fascinating viewing.
The egos, arrogance, and rivalries are there, but they're balanced by a huge amount of competitor encouragement and friendly advice. How much of it was chosen for that specific purpose is unknown.
What comes through the most is that an unshakeable belief in oneself is just as important to success as hours spent gurning at the gym.