My knees have also been giving me troubles since taking meds 6 months ago...today I am hitting the treadmill again. In fact on it right now. I place a board on the rails and put my laptop on and start walking. I use to do this all the time but haven't in at least 6 months if not longer and I can feel it...my legs, butt, stomach have all gained and I feel blah...so starting today I am doing at least 1/2 hour a day. Hope I stick to it this time. So far my legs feel fine...but have only done 8 mins. LOL The times flies if you can read this board while walking