Immortality!

   Commercials make dubious claims as a matter of course, but a recent radio ad by the American Heart Association especially caught my ear.  The claim sounded so fantastic that I went to their website to confirm, and there it was!  About halfway down the page, it proclaims that "for each hour of regular exercise you get, you'll gain about two hours of additional life expectancy."  The bottom line: if you exercise for 12 hours a day, you will never die!  Let's see, that means I only need to increase my current regimen by... 12 hours.