Intervention/Measurements: After consideration the inclusion and exclusion criteria, there will be 60 older adults diagnosed as primary knee randomly assigned to 6 weeks of Tai Chi exercise (40-minutes classes/third times per week) or waiting list group. The primary outcome will focus on physical status measured by the Short Form-36 (SF-36) regarding the physical component summary (PCS) and adjusted for baseline assessment. The sequent measurement will be assessing at the 4 weeks, 8 weeks, and 12 weeks.
Outcome: The efficacy of the intervention will be adjusted with other factors including physical fitness, emotional, stress, self-efficacy, SF-36 health-related quality of life (HRQOL), and a precise balancing activity test (Time-Up and Go
Outcome: The efficacy of the intervention will be adjusted with other factors including physical fitness, emotional, stress, self-efficacy, SF-36 health-related quality of life (HRQOL), and a precise balancing activity test (Time-Up and Go