This paper aims to identify and describe the main sources of national-level surveillance data on physical activity in adults and children in England, in order to identify any important gaps. This is distinct from the measurement of physical activity at a local level in order to evaluate the impact of specific interventions or for local needs assessments. The paper focuses on data on the population prevalence of physical activity, but also includes key sources of available data on determinants of physical activity (such as characteristics of the built environment).

• Obesity