Many years ago I heard an interview with Jerry Seinfeld that had an interesting piece of advice. He said your job isn’t having fun onstage, you should be working! I agree, your first job is to work, but that doesn’t mean you can’t have fun at the same time.
Here’s how sweaty I am after a show:

I know it’s gross, but I busted my ass onstage! It was fun, but I worked
-Louie