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 [Internet]. 2025 Oct. 10 [cited 2025 Oct. 21];17(3). Available from: https://competitor.idjournal.eu/index.php/competitor/article/view/378