“The Effect of Interval Training and Fartlek Training on VO2Max of MA Syekh Yusuf Futsal Extracurricular Participants in Motivation”. COMPETITOR: Jurnal Pendidikan Kepelatihan Olahraga 17, no. 3 (October 2, 2025): 2185–2195. Accessed December 8, 2025. https://competitor.idjournal.eu/index.php/competitor/article/view/421.