MELYA AVITASARI; MUH ISNA NURDIN WIBISANA; IBNU FATKHU ROYANA. Psychological Factors Associated with the Decline and Improvement of Taekwondo Athletes’ Performance at Gubug Monster Club. Musamus Journal of Physical Education and Sport (MJPES), v. 8, n. 2, p. 825-837, 7 Apr. 2026.