Article: Exercise: benefit or risk?

Exercise: Benefit or Risk?

Suppose someone were to offer you a magical substance guaranteed to lengthen and improve the quality of your life? This stuff would cut in half your risk of heart disease, make a dramatic improvement in the delivery of oxygen to your body muscles, decrease your mental anxiety and depression, and lower your blood pressure and cholesterol levels. Would you believe that such a potion really existed? If medical evidence supporting these claims could be provided, would you be willing to sacrifice to obtain this health-saving nostrum?

Such a potion does exist, and although time and effort are involved, it can be obtained quite ...

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