I'm just getting started back. My knees got VERY sore for some reason before xmas. I assume it was the resistance leg exercises I was doing and doing the WATP in the basement where the floor is carpet/pad over concrete. I'm now doing it in the family room where the floor is carpet/pad over wood. I also ditched the resistance I was doing on my legs. Walking will just have to be enough exercise for my legs.

I just hope I can stay with it and not get sore knees again.