Introduction to the Global Matrix 2.0: Report Card Grades on the Physical Activity of Children and Youth Comparing 38 Countries

in Journal of Physical Activity and Health

Tremblay is with the Healthy Active Living and Obesity Research Group, Children’s Hospital of Eastern Ontario Research Institute, Ottawa, Ontario, Canada. Gonzalez is with the Dept of Public Health, School of Medicine, Universidad de los Andes, Bogotá, Colombia. Katzmarzyk is with Pennington Biomedical Research Center, Baton Rouge, LA, USA. Onywera is with the Dept of Recreation Management and Exercise Science, Kenyatta University, Nairobi, Kenya. Reilly is with the Physical Activity for Health Group, School of Psychological Sciences and Health, University of Strathclyde, Glasgow, Scotland. Tomkinson is with the Alliance for Research in Exercise, Nutrition, and Activity (ARENA), School of Health Sciences & Sansom Institute for Health Research, University of South Australia, Adelaide, South Australia, Australia; and the Dept of Kinesiology and Public Health Education, University of North Dakota, Grand Forks, ND, USA. Tremblay ( is corresponding author.