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Study finds exercise adds to life expectancy, even for obese

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So, what’s it worth to lace up those sneakers and break a sweat for about 30 minutes a day? About 3.5 extra years of life, on average — and about 4.2 additional years for those willing to step up the intensity or put in closer to an hour a day of brisk walking or its equivalent, according to a new study. Even for the severely obese — those with a body mass index above 35 — exercising for about 2.5 hours a week at moderate intensity or for 75 minutes at vigorous levels puts average life expectancy a notch above that of a normal-weight person who is sedentary, the research shows.

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