1, diamond-shaped movement, stand up straight, fasten your hands behind your back, and try to keep the scapula muscles close together. Hold 10 second, relax and repeat 5- 10 times.

2. Hold your chest out, sit in a chair, put your hands on your sides naturally, and put your feet flat on the ground. By inhaling, gently lift your chest muscles to the ceiling, keeping your eyes straight and your chin parallel to the ground. Hold this position 10 second, and then relax. Repeat 5- 10 times.

3. Stretch your chest in the corner. Stand facing the corner, raise your hands to shoulder height, hold the wall with your left and right hands respectively, then lean towards the corner and stretch your chest muscles 15 seconds until you feel the muscles relax. When doing this exercise, it should be noted that increasing or decreasing the height of the palm wall can change the stretching position and strength of the chest.