So there are a lot of comments here about it, but going to give one of my own -

I've had back pain for the past year. Still trying to figure out the right treatment. But what ALWAYS helps, is a Lagree fitness class (and by extension I'd say pilates would too). Some of hte moves help more than others, but I can go with my back hurting, and I quickly get to where I don't even notice it in the class (because everything is engaging muscles and taking pressure off my back), and by the end of the class I feel great. Two days later it will be back, but, that's also when I take the next class. Still trying to figure out what to do on off days to keep it from returning, and so hopefully able to heal, but, yes. Find something that will keep your back protected, but still work it (and the rest of you).