Following an increasing focus on learning outcomes in the German educational system, the individual health literacy is defined as one central target figure within school-based health education. In this context, physical education (PE) in school plays a crucial role. Since nearly all children and adolescents are reached, PE represents the most important setting for empowerment and motivation towards a healthy, active lifestyle. However, the role of PE regarding the promotion of physical activity (PA)-related health competence has not yet been empirically analyzed. At the same time, there is a lack of measuring instruments taking into account a holistic, biopsychosocial understanding of health. This shortage constitutes a problem in particular for the adaptation of educational concepts to the knowledge base of school students of different age groups and school types. Therefore, this project aims to extend the measuring instruments for the assessment of PA-related health competence of school students. The project will be based – among other theoretical approaches – on the model of PA-related health competence (Sudeck & Pfeifer, 2016). Special emphasis will be placed on competencies related to positive regulation of psychological health and wellbeing as well as on critical reflection and appraisal in the health domain. The findings of this project might contribute to the development of concepts for teacher training and target group-specific education in the field of health education in PE.