I didn't read all the posts so this may be redundant but I'm a swimmer (65 y/o) and I see lots of overweight people swimming next to me. When my wife had a broken hip, she went to the PT one time and we never went back. I got her in the pool just walking and she recovered very well. The water will provide buoyancy and you can swim or walk at whatever level of intensity you choose. You can also do water aerobics. I've never done chair yoga so I know nothing about it but this option provide as much motion as you wish, not static positions. Best of luck!