At my Y we have shallow, deepwater, and aquazumba. Ask the aquatics director for a description, and even go and observe classes, if you want, ahead of time. If you don't *fear* water, even if you can't swim well, you'll probably enjoy and get more out of deepwater. We do zumba in the shallow end, but it's more aerobic than the other shallow classes offered. All are GREAT, and I think you'll make friends as well as get fit!
Terri