Ti does the elliptical with bad knees! i somehow doubt your mom was up to doing that either before or after the surgery. That kind of thing will aid her recuperating time, she is fit.
oh, I am not doing the elliptical much at all lately....too much pain. I try, but nothing like I used to do. No elliptical with the partial...another reason to go with the full monty. I miss my elliptical.