Anwarudin, M., M. Iqbal, and T. B. Norito. “Correlation of Blood Muscle Strength and Waist Flexibility to students’ Roundhouse Kick Skills in Putera Sekar (Pencak Silat) Academy”. ETUDE: Journal of Educational Research, vol. 1, no. 1, Nov. 2020, pp. 7-12, doi:10.56724/etude.v1i1.16.