Best not to think too hard on it....

[dvandom]

Just saw a PSA that proclaimed that for every hour of exercise, such as brisk walking, you could live an extra two hours. Oooookay. So, if I exercise for an hour, I spend one of those two hours exercising, and get a bonus hour to live beyond that. Or I could not exercise for that hour, and have the same hour to do non-exercising stuff that I'd have if exercising. Not exactly a compelling argument, eh? ;) Still comes down to, "if you like exercising, you get to do it at no net cost", not "if you don't like exercising, here's a reason to start!" They need a slightly better argument, methinks.