I had replied to a simular post like this before.

We do not have the capacity to build muscle strength but we can stretch our muscles and remain flexible.

Get a simple pilates kit with 3 strength bands and video. Start with the litest band if you have to. Some days you may be able to use a heavier band and the next day you may have to go lighter. Some days you can do more reps and some days less. Doesn't matter.

Staying flexible is so important even if you are getting weeker.

I did go to a physical therapist for pilates but it's a hasle and takes extra energy to get out 3 times a week but she did get me started and I found I could do most of everything at home with bands.

Good luck;

Tony