“the The Effect of Oregon Circuit Training and Tabata on Increasing VO2Max in Male Junior Karate Athletes at Tako Dojo Kodim 0206 Dairi in 2025: Eng”. COMPETITOR: Jurnal Pendidikan Kepelatihan Olahraga 17, no. 3 (October 30, 2025): 2771–2779. Accessed December 8, 2025. https://competitor.idjournal.eu/index.php/competitor/article/view/402.