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Masteroppgave folkehelsevitenskap - Universitetet i Agder 2016 Background: Two different intervention models were developed to increase participation in physical education in high school, targeting “motion enjoyment” and “sport enjoyment”. Both models are intended to increase the pleasure of physical activity in physical education, as well as to contribute to the development of students’ skills, abilities and increase future commitment. The intention behind the motion enjoyment model is to reinforce positive experiences which are related to physical activity, along with raising the awareness in young people of the health benefits associated with physical activity. The sport enjoyment model leans more towards traditional sports competitions; where activity skills, techniques and improvement of physical performance are considered important. The aim of this study is to explore the relationship between self-efficacy, health related quality of life and self-reported physical activity. Furthermore, investigating differences among students following the two different intervention models. Method: This study is a cross-sectional study in which self-efficacy is measured using General Self-Efficacy Scale, HRQOL with KIDSCREEN-10 and self-reported physical activity with stage model. Various analyzes were carried out to compare students in the two different groups, such as: Independent sample t test, one-way ANOVA and chi-square. As well as a multiple regression analysis exploring the possibility of demographic variables, health-related quality of life and self-reported physical activity could be associated with self-efficacy. Result: The sport enjoyment group reports higher self-reported physical activity and health-related quality of life. Multiple regression analysis showed that the level of health-related quality of life along with the independent demographic variables such as degree of satisfaction, participation in physical education and the number of hours of exercise/activity was associated with self-efficacy. When the relationship between self-efficacy and physical direction was explored results showed that the motion enjoyment group was associated with high self-efficacy. Conclusion: Overall there seems to be a correlation between self-reported physical activity, health related quality of life and self-efficacy. Significance was found only among some of the variables of self-reported physical activity and self- efficacy, for instance stage model did 5 not demonstrate a significant association between the two. From a public health perspective the combination of self-reported physical activity level, health related quality of life and self-efficacy contributes to increased sense of empowerment and wellness. Also, forming a foundation of a healthy and active life in adolescents. This is regarded as crucial in the work of health-promotion as a preventive measure. Keyords: self- efficacy, health related quality of life (HRQOL), self-reported physical activity, youth