If we take this research at face value, we learn a few things. First, some exercise reduces your risk of death. Second, the optimal walking/jogging exercise is light to moderate jogging. The optimal speed is between 5 and 7 mph, and if you do 25 minutes about three times a week, you're all set. Nothing in the data suggests that running more — farther, or faster — will do more to lower your risk of death.
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