Body self-concept is one of the components of self-concept, and it refers to the perceptual experience of body appearance and attitude towards one's own body appearance. It develops during adolescence and, given its significant link to psychological well-being, is of interest to researchers. Research predominantly covers the period of adolescence, while significantly less attention is paid to body satisfaction in emerging adulthood. The aim of this study was to examine body satisfaction in emerging adulthood with respect to gender and engagement in physical activity. The study involved 756 participants aged 18 to 25 years, or 568 girls and 188 boys. Participants completed an online questionnaire which, in addition to their sociodemographic characteristics, collected data on physical activity and satisfaction with body appearance. The results showed that people who engage in physical activity, on average, have higher levels of satisfaction with their body compared to people who do not engage in physical activity. Also, the difference in satisfaction with body appearance depending on physical activity was evident only among males, but not females. No association was found between age and body satisfaction.