I was practicing the beginning of the san ti shi with the bend and coordinated arm movement. I was trying to not float from the crown point, not sure if I was doing it correctly or not but the thing I was noticing was that when I was unbend and the arms would go down I could feel a stretch or like a rubbing against the lower back/ribs along the side of the back. It was more pronounced on the right side but I could feel it faintly on the left side as well. Is this related to the transverse couple or is this just a passing sensation.

Many don't like this sort of thing, to me, any additional awareness is good for TaiJi and Chinese Internal Arts in general.

Up until now when I've done the San Ti Shi I've felt a big stretch in the back like I was getting rid of some of those fascia crosslinks and getting more mobility. Today when I was doing San Ti Shi I noticed though that the out reached hand side of the body could feel a closing of the ribs sensation when I was thinking about the elbow rotating inwards and the hand going forward. I also could noticed a connection through the arm pit area with the out stretched arm.