“The Effect of Predictable and Unpredictable Training Methods On The Reaction Speed of Futsal Goalkeepers”. COMPETITOR: Jurnal Pendidikan Kepelatihan Olahraga 17, no. 2 (August 6, 2025): 1767–1775. Accessed August 24, 2025. https://competitor.idjournal.eu/index.php/competitor/article/view/257.