I came across these verses attached to the postures in the Tai Chi form. I got them from a Chinese friend and fellow practitioner. Who knows what the real origin is? There are claims that some of them come from Yang Chengfu. In any case, they're pretty interesting and I enjoyed the translation effort. So, for anyone who's interested ...
Oral Formulas for the Postures in the Tai Chi Form:
https://www.rockymountaintaichi.com/s/Oral-Formulas-for-the-Postures-CMC-New-Method.pdf