• Centers for Disease Control & Prevention (CDC)/Physical Activity & Health:
   http://www.cdc.gov/physicalactivity/everyone/health/index.html

• Mayo Clinic/Preparation:
   https://www.mayoclinic.com/health/walking/HQ01612

• Pedestrian & Bicycling Information Center/Walking More:
   http://www.walkinginfo.org/why/tips_walking-more.cfm

• Shape Up America/Tips for Everyday Workouts:
   http://www.shapeup.org/publications/fitting.fitness.in/noframes/workday.htm

• CDC/Overcoming Barriers:
   http://www.cdc.gov/physicalactivity/everyone/getactive/barriers.html