I did physical therapy for my knees during the months of March, April, and May. I started with pool therapy and went twice a week for 45 minute sessions. I found that pool therapy was easier and less painful, but it would wipe me out. I assume this occurred because the water was so warm. I had to stop at times and sit on the steps and drink cold water because I was getting so hot. I switched to regular pt and while it was more challenging I usually didn't have the same problems with fatigue and legs that felt like they were going to give out.