“The Effectiveness of Mental Toughness Training Ad – Menstren Model in Badminton Sports for Students of SMP Negeri 2 Jambi City”, Compet. J. Pendidik. Kepelatihan Olahraga, vol. 17, no. 3, pp. 2677–2683, Oct. 2025, Accessed: Mar. 19, 2026. [Online]. Available: https://competitor.idjournal.eu/index.php/competitor/article/view/378