Prolonged sitting (sedentary behaviour) is a risk factor for various chronic health conditions in adults, and is associated with precursors of these diseases from early childhood. The Australian Physical Activity and Sedentary Behaviour Guidelines state that children and adolescents should minimise the time they spend being sedentary every day. However, children and adolescents spend more than 60% of their waking hours sitting, with much of this occurring at home, in transit, and at school. Simple changes to the school environment to reduce prolonged sitting and promote physical activity can be made to benefit young people’s health and learning outcomes. This presentation will cover the latest evidence of the efficacy of reducing young people’s sitting through pedagogical approaches in the classroom, novel homework, and also changes to the school and classroom environments. Consideration will also be given to using objective devices to monitor changes in not just the total volume of sedentary behaviour, but also the manner in which sedentary behaviour is accumulated. For example, in sustained versus shorter bouts, and the frequency and intensity of breaks in sitting. It is important that strategies to engineer movement back into young people’s lives are feasible, effective and cost effective.