Sumarni , Y. L., Putri, R. S. M., & Devi, H. M. (2026). The Effect of Static Flexibility Training on Knee Joints Stiffness in Older Adults . SURYA: Jurnal Media Komunikasi Ilmu Kesehatan, 17(03), 124–132. https://doi.org/10.38040/js.v17i03.1245