I don't know if there is one near you, but I really like Stroller Strides- you can work out with your daughter. I got back into working out doing Stroller Strides- I have a 5 yr old DD and a soon to be 3 yr old DS, and I thought it was great for them to see me working out, and they got to make new friends as well- as during the ab/stretching portion all of the toddlers and above get out and play.
I wish it worked w/ my kids' school schedule now, but it doesn't. Hopefully we can go back this summer, then it's even better because it's outside.

Personally I like classes like Stroller Strides, because there is a peer pressure element I need to complete a whole workout. It's an hour w/ both cardio and strength training. I would have a really hard time staying focused at the gym for an entire hour.

I took classes when I was a gym member, a couple dance-based ones (like Zumba) and one weight-lifting one. When I got more confident I started using the eplitcal machines, weight-lifting machines, and the sit up thing where you throw the ball and it bounces back to you and sit up to catch it.

Does you gym offer a 1 time free trainer session? They'll show you some moves and how to use the machines.

I mainly enjoyed the classes though. If we had kept going I would have tried the kick-boxing one, the belly dancing class, and the yoga/pilates class, but they didn't have good times for me and we could't afford it anymore.

My husband and I bought a cheap sparring set and we will sometimes use it to get in a work out. My husband also like to "invent" work outs for me to do to push me farther than I would push myself. He does the exercises along with me and gets his own work out in. We also picked up INSANITY last year and we use it as a competition (who can do more without dying).