In Xingyi, the Zuan moving pattern belongs to Water in the Five Elements. The Qi circulates like water flowing in a curved river: smooth, and reaching every tiny area. When the Qi circulation can be smooth and harmonious, the Qi in the kidneys can be regulated. Zuan Quan creates Beng Quan, and just as water douses fire, it destroys Pao Quan.

From the point of view of Nei Gong, the motions of Zuan Quan alternatley tenses and relaxes the back muscles, which massages the kidneys. The kidneys control the water in the body and are responsible for the moisture balance in the body. When your body is properly moisturized there will not be too much Fire (i.e., too much Yang), the clean Qi can be raised, and the dirty Qi can be sunk. This allows the mind to be calm and the body's Yin and Yang to be balanced.

Song of Zuan Quan
The front Yin palm is facing downward and the rear Yang hand is drilling upward. The emitting hand drills up as high as the eyebrows. The two elbows are embracing the heart while the moving the rear foot.

The eyes stare at the front fist while the Qi reaches to the four extremities. When Zuan Quan is changing postures, the body moves. The front foot steps first and the rear foot follows. The rear hand is Yin and hides under the forward elbow.

With each step the three points must be aligned. The front Yang fist strikes the tip of the nose, the little finger turning upwards as the elbow protects the heart. In Zuan Quan, step forward and strike the tip of the nose. The front palm grabs the the opponent's wrist, pulling down and to the side. Step forward and turn the palm strike, striking the tiger relies on this.

<--- | --->