Physical activity (PA) habit decreases and Body Image (BI) becomes important during adolescence. This paper focuses on determining two things: whether the level of participation in PA contributes to adolescents' PA attitudes and their quality of life-related body image and to examine whether there is a difference. The study utilized the cross-sectional design. 1281 individuals in the middle adolescence period participated in the study. Participants were between 15 and 17 years. International Physical Activity Questionnaire Short Form (IPAQ-SF), Cognitive Behavioral Physical Activity Questionnaire (CBPAQ), and Body Image Quality of Life Inventory (BIQLI) were used as data collection tools. According to the study findings, there were significant differences in the BIQLI total, interaction with the opposite sex, and influence behavior/attitude between those who engaged in regular or irregular PA and those who did not engage in PA at all. Difference in the effect on self-efficacy and daily life sub-dimension was found between those who engaged in regular PA and those who did not. Outcome expectation and self-regulation items of those who engaged in PA were higher than for those who did not. Since adolescents are expected to engage in regular or irregular PA, personal barriers in front of them must be removed. It is therefore important to support their attitudes, which positively affects their PA, because participation in PA contributes positively to their PA and BI-related quality of life.