I have feet & legs pain, I cannot stay on my feet too long. Are there exercises that I can do in a chair? I walk more when I can, I mostly use my wheelchair, I been using my legs to push me, that exercise. I need to keep my legs strong, cuz of my Cerebral Pasly. I have a thigh master, I used to have more exercise equipment, I used to have an exercise ball. I already lost 23 lbs