The focus of our research group is on conducting research studies in a real-life setting, and not in a laboratory setting. For example, we implement and evaluate interventions at schools, at the workplace, in specific neighbourhoods, etcetera.  We use specific instruments to measure behaviour and behavioural determinants, such as (online or mobile) questionnaires, instruments that objectively measure physical activity and/or sedentary behaviour (e.g. accelerometers, inclinometers) and GPS devices that measure the specific location where people are physically active. We also use activity trackers and smartwatches (e.g. Fitbit, Polar).