Couch potatoes, your last excuse is gone. You knew you should be getting into your running shoes and hitting the pavement. After all, everyone concedes that exercising is one of the best ways to stave off heart attacks and other health problems. But hard physical exertion is downright unpleasant, and you -- along with about 50 million other sedentary Americans -- could be forgiven for putting it off or avoiding it altogether.
No more, though. A study published last week in the Journal of the American Medical Association says that even a minimal amount of exercise -- a brisk half-hour walk...
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