The document discusses a project in the London Borough of Camden aimed at increasing physical activity levels among children and adolescents. It notes that many children and girls in particular do not meet physical activity guidelines. The project involves designing new playgrounds at schools and using accelerometers to measure physical activity levels before and after the playground upgrades, to evaluate if the new playgrounds increase activity. It also involves fitness testing of students. The goal is to determine if upgraded playgrounds can successfully increase physical activity and improve health and well-being.