So I went to my doctor for the back spasm. It's getting better and she gave me a script for painkillers. Once I recover she recommended either yoga or pilates. I did yoga in college, but now my main forms of exercise are walking, hiking and skiing in the winter.
Any recommendations? Pacific Northwest Ballet offers a Saturday pilates mat class, they also have the private and semi-private classes (with the Reformer I think it's called). In my neighborhood I have a traditional yoga place and a Bikram (hot) yoga place.