Ahead of the release of Terminator: Dark Fate, Schwarzenegger spoke to LADBible, describing himself as a "fanatic" when discussing proper technique and shocker, turns out he absolutely hates lazy form.
"When they do half a rep, or when they do chin-ups and they just go half way up," Schwarzenegger said.
"Or if they do a pull-down exercise or curls and they just sit there and do half a curl. You have to concentrate when you do everything. You've got to feel the bicep, you've got to squeeze it and do it the right way because then that rep really has an effect, otherwise it doesn't have any effect and therefore you're wasting your time.
"It drives me nuts when I see them in the gym," he continued. "I've been seeing this stuff for 50 years because I was always a fanatic about doing the movement the right way - don't cheat on yourself, just do the exercise the right way. Even if you have a trainer and they don't look, you should still do it the right way. Those are the kind of things I see in the gym," he continued.
Sometimes, it'll bother him so much that he feels compelled to step in.
"Sometimes I feel comfortable enough to walk over to someone and just say, 'I think you would be better off if you did full reps and if you do them the proper way,'" he adds.
Curious how The Terminator got in shape for his upcoming movie? Click here for his workout and diet plan.
WATCH: First trailer for Terminator: Dark Fate is here