| http://www.w3.org/ns/prov#value | - you have a chronic health problem, such as heart disease, diabetes, or obesity, or if you are at high risk for these conditions, first consult your health care provider before beginning a new program of physical activity.If you are older than 50 and plan to begin a program of vigorous physical activity, first consult your health care provider to be sure you do not have heart disease or other healt
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