Most people and all doctors believe that physical exercise makes you live longer. There is no evidence for this idea. In longitudinal studies, people who exercise more tend to live longer, true, but in studies where long-lived people were interviewed, the long-lifers were no more likely to have exercised than anyone else. In fact, they were less likely to have exercised.
This apparent paradox is a consequence of the healthy survivor effect, i.e. the people who were more healthy to begin with were the ones most likely to exercise. Notice, that does not imply that the exercise itself made them more healthy.
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