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Michael Pratt, MD, MPH

JAMA. 1999;281:375-376.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

It is now clear that regular physical activity—bodily movement that is produced by the contraction of skeletal muscle and that substantially increases energy expenditure—reduces the risk for coronary heart disease, diabetes, colon cancer, and several other major chronic diseases and conditions.¹ Exercise, as a subset of physical activity,¹ is planned, structured, and repetitive bodily movement done to improve or maintain 1 or more components of physical fitness. For many people, the New Year's resolutions to get more exercise have been on target. How to get that exercise or, to use today's favored terminology, physical activity, is the subject of 2 articles in this issue of THE JOURNAL.^2-3 Since the term aerobics was first adopted as a popular description for endurance exercise in the 1960s, the health and fitness benefits of 20 or more minutes per day of vigorous exercise such as jogging, swimming, or cycling have . . . [Full Text of this Article]

Author Affiliation: Division of Nutrition and Physical Activity, Physical Activity and Health Branch, Centers for Disease Control and Prevention, Atlanta, Ga.

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