Payame Noor University Health Psychology 2322-1283 6 24 2018 03 11 Effects of Web-Based Physical Activity Interventions on Physical Activity and Well-being in Adolescents with Insufficient Physical Activity Effects of Web-Based Physical Activity Interventions on Physical Activity and Well-being in Adolescents with Insufficient Physical Activity 53 68 4535 FA Asghar Ahmadi M.A. in Sport Psychology, Young Researchers and Elite Club, Urmia Branch, Islamic Azad University, Urmia, Iran. Mohammadtaghi Aghdasi Malek Ahmadi Assistant Professor in Motor Behaviour, Young Researchers and Elite Club, Urmia Branch, Islamic Azad University, Urmia, Iran Journal Article 2017 04 16 Objective: The aim of the present study was to examine the effects of web-based physical activity program interventions on the rate of physical activity and psychological well-being in adolescents with insufficient physical activity. Method: The research methodology is semi-experimental including pretest-posttest design.the Number of 60 adolescents with insufficient physical activity (15-17 years old) from Tabriz city were selected in non-probability purposive sampling. Participants were randomly assigned to equal groups: experimental group (web-based physical activity intervention, 24 programs during 8 weeks) (N= 30) and control group (without intervention) (N=30). Participants completed a series of questionnaires which assess the amount of Physical Activity (light, mild, vigorous and total) and Psychological Well-being (positive and negative affect, subjective vitality). Results: The results showed that Web-based physical activity intervention has a significant effect on the amount of physical activity (light, moderate, vigorous, and total), and on psychological well-being (positive affect, negative affect, and subjective vitality). Conclusion:<em> </em>Overall, these findings suggest that the use of web-based physical activity intervention can lead to promoting in physical activity and psychological well-being among sedentary adolescents. Objective: The aim of the present study was to examine the effects of web-based physical activity program interventions on the rate of physical activity and psychological well-being in adolescents with insufficient physical activity. Method: The research methodology is semi-experimental including pretest-posttest design.the Number of 60 adolescents with insufficient physical activity (15-17 years old) from Tabriz city were selected in non-probability purposive sampling. Participants were randomly assigned to equal groups: experimental group (web-based physical activity intervention, 24 programs during 8 weeks) (N= 30) and control group (without intervention) (N=30). Participants completed a series of questionnaires which assess the amount of Physical Activity (light, mild, vigorous and total) and Psychological Well-being (positive and negative affect, subjective vitality). Results: The results showed that Web-based physical activity intervention has a significant effect on the amount of physical activity (light, moderate, vigorous, and total), and on psychological well-being (positive affect, negative affect, and subjective vitality). Conclusion:<em> </em>Overall, these findings suggest that the use of web-based physical activity intervention can lead to promoting in physical activity and psychological well-being among sedentary adolescents. https://hpj.journals.pnu.ac.ir/article_4535_21973045f4fa35e762ec2ad7fd7ae574.pdf