Hoo boy, I am the last person to ask on this one. I’ll “fling” my experience—and, by no means at all, am I expecting you to do what I did.
I opted out of joining a gym for this reason. I’m a tad bit paranoid about germs, and I didn’t like the age range being watched (or the caregiver ratio) at the gym I would have used, so I don’t do the gym thing.
I bought a DVD, exercise with the kids, and (while I won’t be losing gobs of weight fast) that is what I can live with. For me. For my kids.