Mirror Within: Exploring the Impact of Physical Activity on Body Image and Anxiety in Youth

<b>Background:</b> Body image, physical self-concept and anxiety are closely intertwined aspects of psychological well-being among youth. The growing influence of social media and appearance-focused culture has intensified self-evaluation pressures, making it essential to understand whether physical activity fosters protective effects or, conversely, contributes to anxiety. <b>Methods:</b> The study examined the relationship between body appreciation, physical self-concept, self-esteem, and anxiety among 246 young adults aged 18-35 years (47.6% athletes, 52.4% non-athletes). Participants completed the Rosenberg Self-Esteem Scale (RSES), Body Appreciation Scale-2 (BAS-2), State-Trait Anxiety Inventory (STAI), and the short form of Physical Self-Description Questionnaire (PSDQ-S). Group differences were analyzed using the Mann-Whitney U and Kruskal-Wallis H tests, and associations were explored with Spearman's correlations. Moderation analyses (PROCESS Model 1) tested whether physical activity buffered BMI-related effects, and structural equation modeling (SEM) evaluated direct and indirect pathways. <b>Results:</b> Athletes reported higher self-esteem and body appreciation and scored higher on all PSDQ-S subscales, alongside lower trait anxiety but higher state anxiety than non-athletes. Higher BMI predicted lower self-esteem, body appreciation, and less favorable self-perceptions. Physical activity moderated the BMI-self-esteem and BMI-body appreciation relationships, buffering negative effects among athletes. SEM showed that physical activity positively influenced physical self-concept and body appreciation, which in turn reduced trait anxiety. Gender differences were minimal. <b>Conclusions:</b> Regular sport participation supports psychological resilience by enhancing self-esteem and body appreciation while reducing anxiety. However, the findings also highlight the complexity of body-mind dynamics where individuals with strong body appreciation may still experience transient anxiety in evaluative contexts. Promoting body functionality, self-compassion, and positive physical self-concept in educational and sport settings may help prevent maladaptive behaviors and foster lasting mental well-being among youth.