I got a free 2-week membership at the YMCA near my house! It's a family centre, so there's lots of teens and kids, especially because of summer and out-of-school camps.
I've been a couple of times now, both for Zumba class (surprise, surprise). Here's a shot of a few ladies warming up in the big gym. The place was PACKED in a few minutes, they are certainly not at a loss for participants. As always, I had a great time at Zumba!