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BackgroundThe benefits of physical activity for the mental health and well-being of children and young people are well-established. Increased physical activity during school hours is associated with better physical, psychological and social health and well‐being. Unfortunately many children and young people exercise insufficiently to benefit from positive factors like well-being.The main aim of this study is to develop, implement and evaluate a multi-component, school-based, physical activity intervention to improve psychosocial well-being among school-aged children and youths from the 4th to the 6th grade (10–13 years).MethodsA four-phased intervention – design, pilot, RCT, evaluation - is carried out for the development, implementation and evaluation of the intervention which are guided by The Medical Research Council framework for the development of complex interventions. 24 schools have been randomized and the total study population consists of 3124 children (baseline), who are followed over a period of 9 months. Outcome measure data at the pupil level are collected using an online questionnaire at baseline and at follow-up, 9 months later with instruments for measuring primary (general physical self-worth) and secondary outcomes (self-perceived sport competences, body attractiveness, scholastic competences, social competences and global self-worth; enjoyment of PA; self-efficacy; and general well-being) that are both valid and manageable in setting-based research. The RE-AIM framework is applied as an overall instrument to guide the evaluation.DiscussionThe intervention focuses on the mental benefits of physical activity at school, which has been a rather neglected theme in health promotion research during recent decades. This is unfortunate as mental health has been proclaimed as one of the most important health concerns of the 21st century. Applying a cluster RCT study design, evaluating the real-world effectiveness of the intervention, this study is one of the largest physical activity intervention projects promoting psychosocial well-being among children and youths. Through a comprehensive effectiveness evaluation and a similar substantial process evaluation, this study is designed to gain knowledge on a broad variety of implementation issues and give detailed information on project delivery and challenges at the school level – among other things to better inform future practice.Trial registrationDate of registration: 24 April 2015 retrospectively registered at Current Controlled Trials with study ID ISRCTN12496336

Physical activity at school can be beneficial to children’s psychosocial well-being. To realise this potential, a school environment that supports physical activity is crucial. Self-Determination Theory provides the basis for one approach, namely to focus on pupils’ need to feel competent, autonomous and related. The purpose of this study was to investigate how pupils experienced a school physical activity intervention based on Self-Determination Theory and to assess whether the components developed for the intervention appeared to increase the pupils’ sense of competence, autonomy and relatedness, thereby furthering their psychosocial well-being. Two schools were selected to take part in a qualitative case study, with one grade four (ages 9–10) and one grade six (ages 12–13) class selected for closer monitoring. Ten semi-structured focus group interviews were carried out, involving 36 pupils, combined with 28 days of participant observations. The data were analysed based on the principles of deductive content analysis, using competence, autonomy and relatedness in the categorisation matrix. Findings showed that the pupils’ sense of relatedness was central to well-being and influenced their sense of competence and autonomy. Changing the physical activity climate to focus on mastery and learning instead of competing and performance was challenging, but in some instances brought about more positive experiences, especially for pupils with limited motivation in school physical activity. Finally, while being given influence and choice evidently promoted the sense of autonomy, some pupils felt uncomfortable choosing activities on behalf of the group.