Schwarzenegger's non-stop iron-pumping

Arnold Schwarzenegger is renowned for being a beefcake, and he wasn't go to let the movie's production get in the way of his work outs!

The former Mr. Olympia star requested the studio supplied him with proper gym equipment so he could train in the jungle every day.

Bill Duke, who played Mac, later said: "Before we shot every day, Arnold and his trainer and all of the big boys, they got up an hour and a half before breakfast and trained. It was this gigantic gym that Arnold shipped to Mexico in these gigantic trucks so that the [hotel] ballroom, that was our gym. Arnold once knocked on my door at 5:30, woke me up. I started lifting with them and they all would start yelling at me to lift more weights and more reps. And that night, I was in so much pain that the next morning when they came to my door and started banging, I pretended that I slept through it so that I wouldn't have to lift with them anymore."