All doctors worth their medicinal salts prescribe exercise as an essential part of healthy lifestyle habits for all their patients. But do they really know who benefits most from exercise? Just as importantly, do they know how much exercise is too much?

A vast body of evidence shows that staying physically active helps people live better, longer. Exercise improves symptoms of a wide range of chronic conditions, from arthritic conditions and asthma to type 2 diabetes, hypertension (high blood pressure) and cardiovascular disease (CVD — heart disease and stroke)...

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