Group Activity Therapy-Based Tai Chi Exercises on Improving Muscle Strength in Older Adults Zuan Nun Alea Syavinka (1) , Kartinah (1) (1) Program Studi Profesi Ners, Fakultas Ilmu Kesehatan, Universitas Muhammadiyah Surakarta, Surakarta, Indonesia , ID Abstract : 43 PDF & HTML : 32 252-260 PDF 10.36590/kepo.v7i1.2023