I'm going to invade my friend's fitness safe space
What is your reason for wanting to invade your friend's fitness safe space?
I'm way fitter than he is
Being fit is great, but it's not cool to try to make others feel bad about not being as fit as you. If your friend doesn't want you in his space when he's trying to exercise, then you should respect his boundaries.
Fuck him and his feelings, he won't kick me out of his planet fitness. I'm going to ask my manager to talk to him.
You should not try to make your friend feel like he is not as fit as you. Exercising and becoming better is not about comparing yourself to others, it is about improving yourself.