American Heart Association.
www.americanheart.org
American College of Sports Medicine. Physical Activity and Public Health Guidelines.
www.acsm.org
Couch to 5K Running Program
http://www.coolrunning.com/engine/2/2_3/index.shtml
Healthways Silver Sneakers Fitness Program for Older Adults.
www.silversneakers.com
National Institute on Aging. U.S. National Institutes of Health. Exercise & Physical Activity: Your Everyday Guide from the National Institute on Aging.
http://www.nia.nih.gov/HealthInformation/Publications/ExerciseGuide/
SparkPeople
www.sparkpeople.com
US Department of Health and Human Services. 2008 Physical Activity Guidelines for Americans.
http://www.health.gov/paguidelines/guidelines/summary.aspx
World Health Organization
http://www.who.int/features/factfiles/physical_activity/en/
