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It’s well known by now that active people typically live longer than those who are sedentary. But precisely what types or amounts of exercise most affect life span has not been clear. Several new studies, though, are beginning to provide some clarity, suggesting that certain activities may be better than others in terms of affecting mortality risk. Perhaps the most memorable of the new studies was conducted by researchers in Europe who turned to a large database of health informationabout middle-aged civil servants in Whitehall, England. The workers, ages 35 to 55 at the start, were followed for a decade or so, during which time they filled out repeated health questionnaires