1. U.S. Department of Human Services. Physical Activity Guidelines for Americans. 2nd ed. Washington, DC: U.S. Department of Human Services; 2018. https://health.gov/sites/default/files/2019-09/Physical_Activity_Guidelines_2nd_edition.pdf. Accessed September 14, 2020.
2. U.S. Department of Human Services. Step It Up! The Surgeon General's Call to Action to Promote Walking and Walkable Communities. Washington, DC: U.S. Department of Human Services, Office of the Surgeon General; 2015.https://www.hhs.gov/sites/default/files/call-to-action-walking-and-walkable-communites.pdf. Updated April 10, 2020. Accessed September 14, 2020.
3. Physical activity. The Community Guide.https://www.thecommunityguide.org/topic/physical-activity. Updated August 28, 2019. Accessed September 14, 2020.
4. Physical activity: built environment approaches combining transportation system interventions with land use and environmental design. The Community Guide.https://www.thecommunityguide.org/findings/physical-activity-built-environment-approaches. Updated February 25, 2020. Accessed September 14, 2020.
5. Physical activity: interventions to increase active travel to school. The Community Guide.https://www.thecommunityguide.org/findings/physical-activity-interventions-increase-active-travel-school. Updated August 28, 2019. Accessed September 14, 2020.