“A little-appreciated dimension of Cheng’s legacy was his willingness to teach non-Chinese students. While he was not the first Chinese martial artist to do this in America, his warm embrace of Westerners, who ran the gamut from experienced fighters to long-haired hippies of the day, proved controversial with the Chinese Association that had initially sponsored his move to New York.”
“Flexibility: Tai chi can boost upper- and lower-body flexibility as well as strength.”
https://www.health.harvard.edu/staying-healthy/the-health-benefits-of-tai-chi