Firmansyah, D., M. Adi Wijaya, and gilang nuari panggraita. “ANALYSIS OF PHYSICAL FITNESS LEVELS OF STUDENTS IN MUHAMMADIYAH PRIMARY SCHOOLS IN PEKALONGAN CITY”. JOKER (Jurnal Ilmu Keolahragaan), vol. 5, no. 2, Aug. 2024, pp. 292-9, http://joker.uho.ac.id/index.php/journal/article/view/240.