(1) Rub the pectoralis major. Sit up or stand upright, keep your head straight, your eyes straight, your mouth gently closed, your tongue on the palate, and your whole body relaxed. Cross your hands on your chest, hold the opposite pectoralis major with your thumb and other four fingers, and knead it from top to bottom for 30 -50 times. Then massage both sides of the sternum with the thumb pulp of both hands, and repeat 10 times from top to bottom. (2) press the chest. Cross your forearms on your chest, keep your palms straight, and massage the contralateral chest with the palm of your hand, starting from the clavicle to the rib arch, and rotate 10 times. Then massage the chest with your palm from top to bottom for 20 -40 times. (3) knock on the chest. Keep your palms straight, apply proper force, and beat your chest alternately 100 -200 times.