While research has shown just one exercise session has its benefits, the U.S. Department of Health & Human Services recommends adults obtain 2.5 hours of exercise per week. For children, a minimum of one hour of "run and play" per day is recommended. The latest statistics released in July 2008 by the U.S. Centers for Disease Control and Prevention state approximately 26 percent of U.S. adults are medically obese. Worse yet, one quarter of U.S. adults are completely inactive with close to two thirds not active enough. To download a copy of the U.S. Department of Health & Human Services' guide titled Be Active Your Way, visit them online at http://www.health.gov/paguidelines/.
Source: U.S. Department of Health & Human Services. October 7, 2008.