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.

太极拳先贤拳经云："其根在脚"，脚为根，脚和脚趾放松，由脚上膝、胯、腰、肩、肘、腕、手、脚松到顶，实脚实足，虚脚虚净，上步变转阴阳。大拳，以百分比说话，百分之百脚下阴阳变化，手不动可少动，形于手指，动则先起于脚的阴阳变转，由脚而腿而腰总须完整一气。上下相随，内外相合，离开脚的根什么也没有了。我在练拳中体验到，脚在拳中的作用，吴式太极拳单腿脚重心，脚的作用之大是根，是阴阳变化的根，我有一决：上下一条线，脚下阴阳变。