Sumarni , Yasinta Lidia, Rona Sari Mahaji Putri, and Hilda Mazarina Devi. “The Effect of Static Flexibility Training on Knee Joints Stiffness in Older Adults ”. SURYA: Jurnal Media Komunikasi Ilmu Kesehatan 17, no. 03 (January 3, 2026): 124–132. Accessed January 8, 2026. https://jurnal.umla.ac.id/index.php/Js/article/view/1245.