Aging is an irreversible and inescapable process. But the effects of aging are, in some cases, reversible and, if not completely escapable, at least subject to delay. There are many factors under our control—diet, gut microbiota, social networks, sleep, regular visits to the doctor. But the single most important correlate of vibrant mental and physical health is physical activity. This doesn’t mean the other correlates (diet and sleep) aren’t important—they are—and it doesn’t mean that if you engage in more physical activity you don’t need to follow other healthy practices. What it does mean
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