Stealing

Is it considered stealing if you take an apparatus which your trainer really likes to make you hang from and do leg pull-ups? There are other ways to work your core. It's unnatural, painful, and I really look like a dork hanging off of it. Worse when trainer has to lift you up because you can't hang on to your own weight. It would be kind to rid the gym of this orture device don't you think? Really, I'd be doing everyone a favor. Only I did mention this to my trainer so he would know who the culprit was if this theft were to occur.