Hi mompiano. Light exercise is supposed to be good for PMR. I had incredible stiffness behind my knees, which even exercise could not get rid of. It was worse when I sat for a while. I did invest in an infrared heating pad, which gave me some relief. Do you use a walker? Is your apartment free of tripping hazards, like scatter rugs? If you're sitting, can you raise you legs, with a bent knee? Make circles with your feet for your ankles? Rest is also important. And you can do leg exercises in bed too. Take care.