Chicken chest is also known as pigeon chest. It is the second common thoracic deformity of the anterior chest wall, less common than funnel chest, with an incidence of about 1 in 1,000 and a male to female ratio of about 4:1, accounting for 16.7% of all chest wall deformities, with symptoms appearing late and more than 50% found after the age of 11. The etiology is not yet clear and may be related to heredity, with a family history of about 20%-25%. The deformity of the sternum is secondary to the rib deformity and can also be secondary to intrathoracic disease. The forward bulging of the sternum is called pectus excavatum. Most people believe that the deformity of the sternum is secondary to rib deformity caused by overgrowth of the ribs and rib cartilage. Self-corrective training methods are: a. Breathing up and down exercise, standing with both feet shoulder-width apart, relaxed body, slightly closed eyes, two arms gently raised forward to the top of the head, while inhaling, stop for a while, the natural descent of the two arms, accompanied by deep exhalation, several times a day, 10 minutes each time. Second, push-ups or holding dumbbells to do two arm front planks exercises 3 to 4 times a day, 10 minutes each time. Third, single and double bars on the tendon head, early in the morning on an empty stomach, but not too strenuous. Fourth, jogging helps to enhance visceral activity, expand breathing volume, improve the thoracic dysplasia. Five, hands clip lifting heavy objects. The palms of both hands in front of the chest and lift heavy objects (such as books, barbell pieces, bricks, etc.), a short pause of 5 to 8 seconds and then put the weight down. Inhale when the force clip lifting, restore relaxation when exhale, repeat 10 to 15 times, a total of 3 sets of exercises. Six, forked waist with chest. Hands forcefully pressed back waist, while doing chest tightening pectoral muscle action, a short pause of 5 to 8 seconds, and then exhale Do open shoulder action, relax the arms and pectoral muscles. Repeat 10 to 15 times, a total of 4 sets of exercises.