Hafiza, Hana, Hernawan, Moch. Asmawi, and Ayu Purnama Wenly. 2023. “Physical Activity Models to Maintain Physical Fitness Based on Simple Devices During the Covid-19 Pandemic For Adolescents”. Gladi : Jurnal Ilmu Keolahragaan 14 (03):250-63. https://doi.org/10.21009/GJIK.143.01.