translation by one of my students..
much of what is translated has been talked about on this site.
Time stamp: 0..1:0:
Need to know what "TaiChi" means in order to learn it well.
TaiChi means: "no pole" (Field/Circle/Empty) which generates "poles" (YingYang/In & out/Body).
The core of TaiChi Quan is to interchange the act of Field affecting body and body reacting to field.
Ying & Yang are two faces of one thing, cannot be separated.
When we contact, we consist of the "no pole" (combine our fields?), if he is Yang, then I will be the Ying; vice versa.
I can hit him by breaking his own Ying & Yang.
I can hit him by my internal as outside is hard, expand my internal out.
I can hit him by my outside, go to my inside then hit him by my outside.
When he came in, I am Ying, then become Yang. I am Yang, then become Ying.
It is all about the ying/yang change.
When he touch me, I can use my circle to hit him; use my center to hit him; my center expanded to hit him.
I can also hit him by changing curve to straight, by my knee, by my hip by expansion, by my Dantian, by my waist due to loosing my shoulder and back to my waist,
I can hit him by my shoulder, shoulder sinks to my YongQuan (on my foot).
I can hit him by one finger softly. When I touch him, I grab his foot root and hit his foot.
The change of Ying/Yang is layer by layer with angle.
I do my form to have my field first, then follow the field, change my shape to bring in my field, I move within my field.
My single foot is not only support my weight, also can farjin. This is due to expansion/compressing; i.e. ying/yang.