The local YMCA in your area probably has classes. At least the one that I do some part-time work in does. They are mostly filled with women, if that's a problem, or maybe it's a plus. I've been tempted to try it, since it's right there, but might try the home route first. Let us know if you find some info, please. I've got a touch of sciatica and my back could stand some stretching, plus age is starting to creep up.
There's other more rigorous exercise/calisthenics type classes also at the Y, and you can usually pay a one day fee if you don't wish to join. Might be a good way to learn some techniques to use at home.
Geoff