Waitlist Control

The goal of this randomized controlled trial is to test whether executive attention unpacks the antidepressant effect of Baduanjin (a form of health qigong) in older adults. The main questions it aims to answer are: * Is Baduanjin an effective treatment to enhance executive attention in older adults with depressive symptoms? * Does Baduanjin work through enhanced executive attention to alleviate depressive symptoms in older adults? Researchers will compare Baduanjin with waitlist control. Participants will receive 12-week Baduanjin training (two sessions per week and 60 min per session).