Hi,
I found this link earlier today about osteoporosis and exercise. <A HREF="http://www.befitoverfifty.com/pages/osteo.htm">
Osteoporosis</A> I am sure there are plenty more around. As for swimming, I am
sure it would help the body, but you should find out if you'd need to do
strength training in the pool to help the bones.
Hope this helps,
Dina