The jin that starts from the feet, is controlled by the waist and is expressed in the fingers
Incidentally, that very well known classical statement is not just unique to Taiji; variations are found in a number of arts. It is the path from the ground to the hands. What I call the "groundpath". The people who don't understand the "groundpath" don't understand the basics of I.S. more than superficially. It's worth it to note how often someone puts his foot into it by belittling the idea of the oh-so-obvious term "groundpath". Granted it's not a Chinese term like neijin or pengjin... but it doesn't take a genius to figure it out. Even though Chen Xiaowang's English is limited, he refers to the one jin that goes from the point of contact to the ground.
So in line with the discussion topic about similarities in I.S. between CMA's and Japanese MA's, someone give me an example of where Tohei, Ueshiba, etc., were standing against a push or pull and *not* using a groundpath.
Moving with a groundpath/jin? Linear movement is called "chou ssujin" (pulling silk). Spiralling movement is called "chanssujin" (reeling silk). They are both built from the static one-jin of the groundpath.
There it is and no one can logically argue it, so probably the conversation will go back to the personal.