خلفة عماد الدين; مزروع السعيد. The effect of a gradual muscle relaxation training program on relieving psychological stress to improve the level of running achievement among long-distance runners less than (17) years . sports creativity, [S. l.], v. 13, n. 01, p. 133–154, 2025. Disponível em: https://journals.univ-msila.dz/index.php/JOSC/article/view/636. Acesso em: 4 feb. 2026.