Rooting in Taijquan, I

Rooting in Tai Chi Chuan
By David West.

"Rooting is the process of making a good connection to the ground in stances and during transitions. ... When we refer to rooting we are talking about rooting the legs (and thus the entire body) of the completed postures as well as the legs during the transitions as well. When we are trying to achieve rooting in Taijiquan, we should visualize below the surface of the floor or ground... much like the roots of a tree. The "Bubbling Well" an acupoint called Yong Quan (KI-1) located on the bottom of the foot should be used as the point from which this imaginary root extends into the ground from which to draw strength. Rooting in Taijiquan will transfer from foot to foot, but never stays equally rooted on the right and the left. The weight should remain on the outer edges of the feet and remain a slight gripping feel with the toes, the ball of the foot, and the heel. Although the Yong Quan never touches the floor, you should still focus on this area as the root of each movement. Techniques to build this skill vary from person to person. I recommend using different visualizations and thoughts to see what works best for each person."

"Rooting: The Secret of Getting Power from the Earth"
By Gaofei Yan and James Cravens

"People lose root because they use the wrong part of the body to focus their strength. For example, when the shoulder moves first in an action to strike, it is incorrect. One should use the lower body to drive the force. No matter how hard one attempts to be soft, they will never truly relax and have power until the lower body drives the force.
Even when one uses the lower body to drive the force, the root can be lost because the shoulder, as well as any other joint or part of the body may interrupt the transference of power. When there is tightness or loss of coordination between the various joints and parts of the body, root will be lost. The hip, leg, etc. must act as one! Many times things inside the body fight against each other. For example, if the inguinal crease (part where the legs connect to the torso) at the hips is tight, the flow of energy will be broken in the body, breaking the root. When one practices in this way, the tightness or lack of body unity can give one the tendency to get injured. Sometimes one locks a joint. The hips and shoulders are typical joints that students will lock which breaks the root."