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2. World Health Organization Global Strategy. Available from: https://www.who.int/dietphysicalactivity/strategy/eb11344/strategy_english_web.pdf. Accessed May 5, 2020.

3. Is there such a thing as sustainable physical activity?

4. Department of Health and Human Services. Physical Activity and Health: A Report of the Surgeon General. Atlanta, GA: U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion; 1996.