Coordinate Upper and Lower Body
According to the Tai Chi Classics the root is in the feet, issued through the legs, controlled by the waist and expressed through the fingers.
“From the feet through the legs to the waist forms one harmonious energy. When the hands, waist, and feet move, your gaze needs to follow in unison. This is what is meant by harmony of the upper and lower body.
“When you first learn Tai Chi, your movements are larger and more open than those of a seasoned practitioner. The larger movements ensure that your waist and legs are moving in concordance, and all parts of the body are in harmony.”
-Tai Chi Classics