This fact sheet introduces the Smart Cities, Healthy Kids study that examines the impact neighbourhood design in Saskatoon has on children's physical activity levels. It is a partnership between researchers at the University of Saskatchewan, and decision-makers in health care services, city planning and local politics. This study is funded for three years (2009-2012) by the Canadian Institutes of Health Research, the Heart and Stroke Foundation of Canada, and the Health Research Foundation. Findings are expected to inform neighbourhood planning and design locally and beyond.