I've started unofficially coaching my friends at the gym?

It's mostly that we are friends and working out together but then they say, "thanks for coaching me" and that is fun. 

right now my apartment neighbor is blasting house music while he showers and it sounds like he's into it. nice.

No but coaching lifting is fun. Coaching is great because you are present with someone while they work to make a better version of themselves and what's better than that?