1. Department of Teaching Sports and Physical Education, Centre for Teacher Training, Technische Universität Chemnitz, Chemnitz, Germany
2. Department of Social science of physical activity and health, Faculty of Behavioural and Social Sciences, Technische Universität Chemnitz, Chemnitz, Germany
3. Department Sport & Management, IST-University of Management Düsseldorf, Düsseldorf, Germany