Especially a dance class. But here's the thing about dance class. Once you get past the age where there's a chance you might show promise as a professional dancer and everyone around you is at the same crossroad, once you're past the age where you like putting on a leotard because it's a safe way to radiate a little sex appeal, dance is still there.
It's there if you've danced most of your life like me and you want to come back to it after a break. Dance class is there if you're a total newbie and have always secretly wanted to learn to dance en pointe. It's there if your body is about as different from a prima ballerina's as you can possibly get when you're sticking to the category 'Human'.
The same goes for painting class or canning class or piano lessons or taking French or Swahili or joining a soccer club. You don't have to be six years old to start doing something to have fun or even to get good. It just takes a while, the same way it does when you're six. Next time you're looking at a flyer for community theater auditions or you're thinking about riding horses or fixing your own car and your brain glumly says Gee, I wish I could do that, what I'd like you to do is say Let's do that.
Because you can. You probably won't be the worst/oldest/fattest/youngest/most inexperienced/awkwardest in the room, I promise. So whatever THAT is, just go ahead and do it.
What have you always wished you could do?