1. World Health Organization. Global strategy on diet, physical activity and health. Geneva: World Health Organization, 2004 [online]. Available from URL: http://www.who.int/dietphysicalactivity/strategy/eb11344/strategyenglish_web.pdf [Accessed 2009 Feb 2]
2. US Department of Health and Human Services. Physical activity and health: a report of the Surgeon General. Atlanta (GA): Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, The President’s Council on Physical Fitness and Sports, 1996 [online]. Available from URL: http://www.cdc.gov/nccdphp/sgr/pdf/chap2.pdf [Accessed 2008 Mar 17]
3. Physical Activity Guidelines Advisory Committee. Physical activity guidelines advisory committee report, 2008. Washington, DC: US Department of Health and Human Services, 2008 [online]. Available from URL: http://www.health.gov/paguidelines/Report/pdf/CommitteeReport pdf [Accessed 2009 Mar 9]
4. Bryan SN, Tremblay MS, Perez CE, et al. Physical activity and ethnicity: evidence from the Canadian Community Health Survey. Can J Public Health 2006 Aug; 97(4): 271–6
5. Prevalence of regular physical activity among adults: United States, 2001 and 2005. MMWR Morb Mortal Wkly Rep 2007 Nov 23; 56(46): 1209–12