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Exercise is deservedly considered the best medicine. It can reduce your risk of heart disease and stroke, lessen your risk of colon and breast cancer, and lower your blood pressure, blood sugar, and cholesterol. It can also improve your mood, cognitive function, and your fitness in everyday life. But what dose of this medicine do you need to improve your health and live longer?
Conventional wisdom is that more is better. However, scientists do not yet know if there is there is an upper limit to the benefits of exercise, or whether there is a point where it can conversely increase your risk of mortality.