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Kohl is with the Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, Division of Nutrition and Physical Activity, Physical Activity and Health Branch, Atlanta, GA 30341. Lee is with the Division of Preventive Medicine, Dept of Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA and the Dept of Epidemiology, Harvard School of Public Health, Boston, MA 02215. Vuori is from Tampere, Finland. Wheeler is with the National Association of Chronic Disease Directors, Atlanta, GA 30341. Bauman is with the University of Sydney, School of Public Health, Center for Physical Activity and Health, Sydney, NSW 2006, Australia. Sallis is with San Diego State University, Department of Psychology, San Diego, CA 92182.The opinions expressed in this article are those of the authors and do not necessarily represent official positions of the Centers for Disease Control and Prevention or the US Department of Health and Human Services.