The Effectiveness of Medicine Ball Sit Up Throw Exercise on Arm and Back Muscle Strength in Junior High School Students: Efektivitas Latihan Medicine Ball Sit Up Throw Terhadap Kekuatan Otot Lengan dan Punggung Pada Siswa Sekolah Menengah Pertama (T. Hidayat , Trans.). (2021). INSPIREE: Indonesian Sport Innovation Review, 2(3), 204-213. https://doi.org/10.53905/inspiree.v2i3.45