Can't run, can't squat, this is really a bit difficult. I don't know if you can do some big movements, think of you lying on your back, and then imagine that you are riding a bicycle, and your legs will imitate the movements of riding a bicycle. The amplitude changes from small to large. This is not a load at all, even walking is heavier than this action!

This is the way I think for you. I don't know if it will work.

If you don't do well, it will be safer to go to the hospital and ask the doctor to prescribe exercise for you.

I hope you get well soon.