Tai Chi & Respiratory
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Links to following studies
https://breakingmuscle.com/fitness/tai-chi-improves-lung-function-for-copd-patients

https://www.researchgate.net/publication/283133086_Effects_of_tai_chi_exercise_on_lung_function_and_exercise_endurance_of_old_patients_with_chronic_obstructive_pulmonary_disease_A_meta-analysis

https://www.semanticscholar.org/paper/Tai-chi-exercise-for-patients-with-chronic-disease%3A-Yeh-Roberts/b432f33e185d5bf2d412cb618f511b46879d3ef9

https://www.networks.nhs.uk/nhs-networks/tai-chi-chi-kung-for-rehabilitation/news/tai-chi-improves-lung-function-in-copd-patients