The YMCA has a very well respected running start-up program for people who have had bypass heart surgery. Some of the people in this program (60's-80's) have gone on to finish marathons. If they had believed that exercise was of little value to them instead (as advocated by certain frequenters of this newsgroup), many of them would probably be dead by now. Check it out; we runners always welcome more to the fold!
I leave you now to your regularly-scheduled newsgroup. If anyone seeks to find me, I can always be reached by pinging me at rec.running!