“The Effect of Interval Training and Fartlek Training on VO2Max of MA Syekh Yusuf Futsal Extracurricular Participants in Motivation” (2025) COMPETITOR: Jurnal Pendidikan Kepelatihan Olahraga, 17(3), pp. 2185–2195. doi:10.26858/cjpko.v17i3.421.