Baharuddin, M. Y., M. Shanmugam, and H. B. Choo. “Biomechanics Analysis on Muscle Activation During Jumping Jack Exercise”. Jurnal Sains Sukan & Pendidikan Jasmani, vol. 6, no. 2, Nov. 2017, pp. 28-35, doi:10.37134/jsspj.vol6.2.3.2017.