Centers for Disease Control and Prevention (CDC)
www.cdc.gov; check out the "Physical Activity Topics" site.
National Institute of Health (NIH)
www.nih.gov; if you click on the "Health" site it will lead you to "Wellness & Lifestyle" which will direct you to the "Exercise/Physical Fitness" site.
U.S. Department of Health and Human Services
www.hhs.gov/disease; if you click "Medline Plus" it will lead to the "Fitness and Exercise" site.
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