Self-confidence and its relationship to the effectiveness of the skillful performance of the smashing hit by players of the specialized volleyball school. Al-Muthanna Journal of Sport Education Sciences, [S. l.], v. 14, n. 1, 2026. Disponível em: https://muthuni-ojs.org/index.php/sjpe/article/view/1306. Acesso em: 14 jun. 2026.