M., & Hagen, K.B. (2005). Can exercise improve self-esteem in children and young people? A systematic review of randomised controlled trials. British Journal of Sports Medicine, 39, 792-798. Department of Health (2004). The benefits of regular physical activity. A report from the Chief Medical Officer. At least five days a week: evidence on the impact of physical activity and its relationship to health. Retrieved September 25, 2006 from http://www.dh.gov/PublicationsAndStatistics/Publications/ PublicationsPolicyAndGuidance/PublicationsPolicyAndGuidanceArticles/fs/en?CONTENT_ID=40809948chk=1Ft1Of. External links National Program for Playground Safety – U.S. clearinghouse for playground safety information The Overprotected Kid – article about adventure playgrounds in The Atlantic Benefits of living within walking distance of a park at The New York Times Play (activity) Outdoor recreation Parks