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 : 170 PDF & HTML : 111 252-260 PDF - en DOI