The Effectiveness of Mental Toughness Training Ad – Menstren Model in Badminton Sports for Students of SMP Negeri 2 Jambi City. COMPETITOR: Jurnal Pendidikan Kepelatihan Olahraga, [S. l.], v. 17, n. 3, 2025. DOI: 10.26858/cjpko.v17i3.378. Disponível em: https://competitor.ojsunm.ac.id/index.php/competitor/article/view/378. Acesso em: 22 oct. 2025.