The Relationship Between Interval Training Frequency and Aerobic Endurance Level Among Futsal Extracurricular Students at SMPN 3 Ungaran. COMPETITOR: Jurnal Pendidikan Kepelatihan Olahraga, [S. l.], v. 17, n. 2, p. 1909–1916, 2025. Disponível em: https://competitor.idjournal.eu/index.php/competitor/article/view/97. Acesso em: 19 mar. 2026.