Is there any adult exercise classes or maybe just stretching classes around that don't cost too much?

Have you checked out the Centra at MCC or the Healthy Life Styles Program at Holy Rosary? Information on both can be found on the web.

You should try some yoga classes.

Silver Sneakers at the Centra.

I might get stuck in a position I don't want to spend the rest of my life in if I tried the yoga thing.