I have done reformer Pilates for 14 years but after my parathyroidectomy and partial thyroidectomy I lost most of the strength I’d built up and had a lot of joint pain. I was miserable and angry but it was either carry on or give up completely so I’m still plodding away, still angry some days but it’s better than nothing. Have you tried reformer? It’s good fun and the reformer gives you more support and feedback.
I also do gentle rebounding. Lots of health benefits including gut and bone strength. Again good fun which I think we all need a bit of!!