International Conference on Physical Activity and Obesity in Children, Toronto, Canada, June 24-27, 2007 The long-term aim of this international symposium is to inform the development of a scientifically-based community strategy to reduce the incidence of childhood and youth obesity through increased sport and physical activity participation. The short-term goal is to assimilate, interpret and share the evidence with key stakeholders to develop recommendations concerning effective physical activity policies and programs at the community level to address obesity in children and youth.