Keywords: Adolescents (13-19 years), Behaviour Modification (e.g., provision of item/tool, incentives, goal setting), Community, Education / Awareness & Skill Development / Training, Grade school aged (5-12 years), Health Care Setting, Home, Meta-analysis, Obesity, Physical Activity, Preschool aged (1-4 years), Primary health care provider office (e.g., Public health nurse, dietitian, social worker), School, Youth Health