You would think. But I've got a client like Carfree, google "Bill Anderson Yuma" He told me that when he had x-rays, his docs had never seen bones so dense (why can't he share?) This guy is crraazy Every year on his birthday, he does something like ride from the Mexican to Canadian border and back, or around the perimeter of Arizona - doing 100+ mile days. Of course he also climbs in and out of the Grand Canyon and runs with his Rhodesian Ridgeback (my patient). I see his 86th birthday is coming up - maybe this time he'll take his poor wife on a cruise or something . . .