“…Defined as "a person's perception of himself formed through his experience with his environment and influenced especially by environmental reinforcements and significant others" (Shavelson et al, 1976, 411), self-concept (SC) is widely acknowledged as an important psychological construct, vital in all parts of human life, and it has been researched in a variety of fields, including education, psychology, sport sciences, mental health, and many more (Marsh and Craven, 2006;Onetti-Onetti et al, 2019;Karimova and Csapó, 2021;Henning et al, 2022;Melguizo-Ibáñez et al, 2022). For decades, empirical research has shown that having positive SC is beneficial for many areas of human functioning (Marsh et al, 2017): fighting against anxiety and distress, for strengthening confidence and resilience, and for being adaptive to handle complex problems and situations (Coopersmith, 1960;Harter, 1990;Dodgson and Wood, 1998;Sommer and Baumeister, 2002), and thus enables many human potentials (Marsh and Craven, 2006;Marsh and O'Mara, 2008).…”