According to public comments, when the hand is even with the shoulder, the included angle between the big arm and the small arm is about 135 degrees. Don't clench your hands, make a fist with your fingers or extend your palm naturally. Exchange back and forth. It is required to relax the shoulder joint, take the elbow joint as the exercise force point, and swing back and forth, first slowly and then quickly. Repeated practice in this way can make practitioners enhance their awareness and application of backswing.
Doing the essentials is the essentials of the action, that is, the essentials of the action. If you master the essentials, you can make the action better, more labor-saving, faster and more accurate.