The research project addresses the problem of declining popularity of the subject of physical education among parts of the student population, focusing on refusal to participate in physical education classes. The research addresses the question of how self-determined learning can be specifically promoted in lower secondary school and what effects the intervention has on student participation in physical education. Based on the self-determination theory (SDT) according to Deci and Ryan (1993; 2000), student work materials and teacher handouts are designed. These will enable students to experience the three essential psychological needs ("Basic Needs") of competence, autonomy, and social relatedness. Previous studies have shown that classroom settings that take these central needs into account can promote intrinsic motivation and thus active participation in the classroom. Physical education teachers should implement the motivation-psychology-based teaching concept for self-determined learning in their lessons on their own responsibility. The designed lessons will be evaluated by video analysis and in-depth, problem-centered student and teacher interviews.