Arrofiu Wakufyatan, Fifit Yeti Wulandari, Muhammad Kharis Fajar, Donny Ardy Kusuma. Implementasi Program Latihan Fartlek Untuk Meningkatkan VO2max Pada Pemain Sepak Bola PSHW Karangagung Usia 19 Tahun Pra Kompetisi Liga Askab Pssi Tuban 2026: Implementation of a Fartlek Training Program to Improve VO2max in 19-Year-Old PSHW Karangagung Soccer Players Prior to the 2026 Askab PSSI Tuban League Competition. isco [Internet]. 2026 Jul. 31 [cited 2026 Aug. 23];4(1):154-6. Available from: https://ejournal.unesa.ac.id/index.php/isco/article/view/82289