Gymtrovert

It describes a person who tends to be more comfortable and loves being at the Gym. Gymtroverts sometimes spend all day at the gym, often think about going to the gym and basically want to live at the gym. The feeling of being at the gym energizes them more than other people.

Them: What are you doing tonight?

You: IDK, Probably go to the gym again.
Them: Haha, You're such a gymtrovert, that is like 4th time this week!