COPD exacerbation requiring ER visit or hospitalization within past month

planned major pulmonary intervention in coming 3 months

severe peripheral vascular disease/claudication or other physical condition precluding walk test

inability to perform bicycle ergometry

severe cognitive dysfunction (MMSE ≤ 24)

inability to speak English

current participation in a pulmonary rehabilitation or regular practice of tai chi

Tai Chi Exercise in Patients With COPD