1, Ti: It is the preparatory action before knocking on the door, and the power source is there. The completion of upswing action directly affects the quality of hitting the ball. When lifting, slightly adjust the natural hand shape that was originally placed on the leg. Wrist arched, hands and drum pestle slightly drooping. The strength at this time is that the forearm drives the wrist. On the basis of the forearm moving upward gradually, the arm also moves upward, and the movements of raising both hands to the chest and behind the ears are basically completed.

2, the action of changing force: When the hand is raised to a suitable height, it is necessary to change the action of hitting the ball. You must be quick and agile when changing troops. The arm and elbow sink rapidly, the wrist bends backward, and the hand and the drum pestle move backward rapidly, which is opposite to the direction when lifting. When the front arm gathers strength downward, it hits the drum.