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Bauman is with the Centre for Physical Activity and Health, School of Public Health, University of Sydney, Australia. Ainsworth is with the Healthy Lifestyles Research Center and Program in Exercise and Wellness, College of Nursing and Health Innovation, Arizona State University, Mesa, AZ. Bull is with the School of Sport and Exercise Sciences, Loughborough University, UK, and the School of Population Health, The University of Western Australia, Australia. Craig is with the Canadian Fitness and Lifestyle Research Institute, Ottawa, Canada. Hagströmer and Sjöström are with the Dept of Biosciences and Nutrition at Novum, Karolinska Institute, Stockholm, Sweden. Sallis is with Active Living Research, San Diego State University, San Diego, CA. Pratt is with the National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, GA.