Very true! My dad is swimming and walking in the water. His surgeon told him to do this. Any kind of exercise in the water is better than outside the water (when your body is injured). I am not sure the real reason but it seems to be working for my dad.
Yes and it is a great form of exercise even if you have great joints. I love nothing more than a good swim! Even when I was younger and had no major issues swimming was the one thing I enjoyed more than anything else.