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From principles for Taijiquan written by the ancestor, it is said that, the base is on the foot. The foot is the base, so relax the foot, the toes. Relax from the foot, the knee, the crotch, the waist, the shoulders, the elbows, the wrists, and the hand, from the foot to the top. The solid step is completely solid while the empty step is completely empty. Exchange the Yin and Yang when stepping. In this boxing, Yin and Yang is exchanging all on the foot. There is no need or less to move the hand, just change the Yin and Yang on the foot. Move from the foot, to the leg, and the waist without a break. The upper follows the lower, and the outer joins the inner. It is useless without the foot. Zhu Datong experienced the function of the foot during I practiced, in Wu-style Taijiquan, the center is on one leg, the foot is the base, the base of change between Yin and Yang. Zhu Datong got a formula, the upper and the lower are in one line, Yin and Yang are exchanging on the feet.