Bull is with the School of Population Health, University of Western Australia, Perth, Australia, and Loughborough University, Loughborough, United Kingdom. Gauvin is with the Dept of Preventive and Social Medicine, Université of Montréal, Montreal, Canada. Bauman is with the School of Public Health, University of Sydney, Sydney, Australia. Shilton is with the National Heart Foundation, Perth, Australia. Kohl is with the School of Public Health, University of Texas Health Science Center, Houston, TX, and the Dept of Kinesiology and Health Education, University of Texas at Austin, TX, USA. Salmon is with the Ontario Ministry of Health Promotion, Toronto, Canada.