Engaging key stakeholders, including students into the process of school-based physical activity (PA) intervention planning is considered important. The present study was part of the preparatory phase of the Estonian Schools in Motion pilot programme and aimed to examine students' perspective of PA opportunities in the classroom. Based on 17 focus group interviews with 92 Estonian children aged 8-15, the results demonstrate that although PA is not yet a natural part of academic lessons in Estonia, students are eager and motivated to practise more PA. Even though they do not associate PA and academic lessons in general, they can come up with a wide range of activities that could make learning process more physically active. Students could identify several activities from incidental and content-related movement to games and energy breaks which helps to broaden the scope of classroom PA.