Amelia, Syeni Ratna, Achmad Sofyan Hanif, Fatah Nurdin, Hernawan Hermawan, and Firdaus Hendry Prabowo Yudho. 2022. “Effectiveness of Exercise Program on Abdominal Muscular Endurance and 20 Meters Running Speed During Covid-19 Pandemic”. Gladi : Jurnal Ilmu Keolahragaan 13 (04):435-41. https://doi.org/10.21009/GJIK.134.08.