We did part horse mane stepping foundation, we just do these along a line. Master Chen said this move require rotation so the body move in a straight line and the arms movement need to keep elbow in.
Another moving foundation is synchronized double negative circle hand opening, during closing we turn the body 180 degree to face the other side, step, then open the arm again. Master Chen pointer is to not open the hand out until you have sure footing, you can not do action during stepping, need to be ’empty’. This is a common error when student step in during push hand, as the tendency is force oneself in. If the opponent feel force then he will immediately resist
