Amelia, Syeni Ratna, Achmad Sofyan Hanif, Fatah Nurdin, Hernawan Hermawan, and Firdaus Hendry Prabowo Yudho. “Effectiveness of Exercise Program on Abdominal Muscular Endurance and 20 Meters Running Speed During Covid-19 Pandemic”. Gladi : Jurnal Ilmu Keolahragaan 13, no. 04 (December 30, 2022): 435–441. Accessed January 8, 2025. https://journal.unj.ac.id/unj/index.php/gjik/article/view/22108.