Public health policy and interventions seek to arrest declining physical activity rates in childhood. Two prominent settings for intervening in childhood physical activity are schools and the home. This paper critically examines how these two spaces are constructed in a way that leads to different physical activity outcomes for children in their early primary years. We draw on child-centred ethnographic fieldwork conducted with a cohort of Year 1/2 (5-8 years) students in a public primary school in Australia over a six-month period, and as well as on Bourdieusean concepts of field, capital, and habitus. The results show that many participants perceived the home to be a much safer environment for physical self-expression compared to physical education and the school playground. The way these spaces are constructed leads to the privileging of certain physical activity habitus (PAH), while some children must manage a divided habitus across these settings, which can increasingly create internal tensions over time. We conclude with a call to utilise theoretically informed approaches to better understand the complex processes occurring across the spaces, and to utilise this insight to develop more nuanced efforts to engage children in physical activity.