Racing Mark Spitz, Outdoor photo exhibition, Madrid, Spain, May 2002,
Sony Cybershot, Focal length 10.4mm, Exposure 1/250 sec @ f6.3, ISO 100, no flash
© Steven Crisp [Click on the photo to enlarge]
Or maybe take up running. Or biking. Or nordic skiing (great exercise when its cold and snowy outside). Just get out there on a regular basis and exercise vigorously. It may be the closest thing there is to the fountain of youth.