Donald A.B. Lindberg, M.D.
Director, National Library of Medicine:
Well I think everyone probably does benefit from regular exercise, old or young, and even if a person hasn't been very much of an athlete all their lives it's certainly never too late to start. I mean, I'm 68, I hope some day I'll actually be old. The exercise on a pretty much daily basis is going to help everybody. (Lindberg swims laps.) Well, the principle exercise for me at this stage is swimming. I've been swimming as long as I can remember, probably age five. Swimming actually has a lot of good attributes but it does almost literally and metaphorically wash away all the frustration of a day, and leave the good things and let you quietly compose your thoughts and maybe your plans for the next day. You know, mankind should never have left the water. This is his natural state. Swimming is great.