Agustian, Febri, et al. “ The Influence Of Fartlek Training On Maximum Aerobic Capacity Of Futsal Extracurricular Students At SMPN 28 Bengkulu Utara”. Multidisciplinary Journals, vol. 3, no. 1, Mar. 2026, pp. 15-20, doi:10.37676/mj.v3i1.1076.