1, front undulation: heavy beat downward, slowly sinking, downward to go evenly, the spine should be vertical, squatting can not be forward nor backward, the spine against the heel sinking, upward lifting should be slow, and the same as when sagging.
2, next to the ups and downs: when sinking out of the right crotch, knees bent downward, the left knee forked the knee of the right foot, the upper body to the left, the head to the right; the opposite direction of the action, out of the left crotch, the right foot pointing to the ground to the left leg pressure, this time the left leg is the main leg, the center of gravity in the left leg, out of the crotch of the upper body can not be leaning forward and backward, to maintain a straight, the top out of the right waist, the head to the left.
3, the feet of the undulation: when the body sinks when there is a leg lift, hook back when the knee can not be forward top, must be vertical backward kicking, and is a hook foot, whenever kicking up to be rapid, the action to be clean, but also with the breathing; when the leg kicked backward when the upper body a little bit of the left and right undulation, can not be vertically undulating; when up the left leg, out of the right crotch, out of the right leg left crotch, this action in the Dai, the left leg is the main leg. This action is very important in Dai dance.