Saputra A, Muzaffar A. Effects of lower limb exercises using a chair on sleep quality, fitness, and risk of falls in the elderly. SPORTIF [Internet]. 2022 Apr. 30 [cited 2024 Dec. 24];8(1):1-12. Available from: https://ojs.unpkediri.ac.id/index.php/pjk/article/view/17668