Mat Pilates tends to increase my pain levels and cause some PEM, but Reformer Pilates has been a lifeline for me. I'm able to do gentle movements, and the pulleys and carriage support my body in all directions. It's like doing a super slow, beginner ballet class while lying on my back.
I tried taking classes, but couldn't handle doing 45 minutes of work all at once. It works best for me to do only ten or fifteen minutes on my own. Sadly, even after months of work, I haven't been able to improve my stamina, but I do feel it helps my core, my breathing, and keeping some muscle tone.