Even the experts and the nutritionists can agree that regular exercise improves your heart and muscles and increases your lifespan. They don’t yet agree on how much exercise you need, but the range is somewhere between 90 minutes and six hours per week of moderate activity, enough to work up a sweat. Others disagree with that, suggesting just a few minutes a day of flatout running or cycling in the form of a short sharp shock is enough to fool your body that it’s getting a good workout.22 The beneficial role of gentle walking is even less clear, but it’s probably still better than doing
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