Gerard Butler's line delivery in this scene from 300 is truly thunderous. | Netflix

300 | Behind-The-Scenes The script demanded that most of the male cast spend the majority of their screen time bare-chested, as per Frank Miller’s original graphic novel. To adequately present themselves as the most well-trained and marshaled fighting force of the time, the entire principal cast underwent a rigorous 8-week training regime organized by Marc Twight, a world-record-holding professional mountain climber. Actors never repeated the same exercise twice, preventing the body from adaptin