ALSO, AN HOUR OF RUNNING WILL SEEM LIKE 7 HOURS OF YOUR LIFE: An Hour of Running May Add 7 Hours to Your Life. “The new study found that, compared to nonrunners, runners tended to live about three additional years, even if they run slowly or sporadically and smoke, drink or are overweight. No other form of exercise that researchers looked at showed comparable impacts on life span.” Hmm.

UPDATE: I’m not dissing running, though I do find it kind of boring. Personally, I do intervals — I walk a mile or two, and do a few 90-second intervals of running absolutely flat-out. Research seems to indicate that that’s just as beneficial as running the whole distance, and it’s easier on my joints.