,,, was visiting the doctor the other day ... the one who put my leg back together after i fell last year (changing a light bulb on the ceiling using, let's say, a not very stable chair :) ... anyway he said the best customers of the a .... clinic in mt vernon, va area are the 35-45 runners, mostly older males. said they keep pounding their joints into pulp. ... said low impact swimming, and then a shot on the bike was the ticket. ... these people have half the hospital named after them, so let's say they may be on to something. since i occassionaly see some of their customers at the mt. vernon rec center heated spa ... robert clair alexandria, va usa