Ali Mardius, Eri Barlian, and Nurul Ihsan. 2023. “The Waist Flexibility and Reaction Speed to Sickle Kicks of Pencak Silat Perisai Diri Athletes”. Journal for Lesson and Learning Studies 6 (1):160-64. https://doi.org/10.23887/jlls.v6i1.61403.