1, Back Stretching: Stretch your arm slightly backwards, raise your hand repeatedly for 20 times, and stay for 8 seconds each time, and do 2 groups.

2. Bend your elbows and open your shoulders: stand up straight, raise your hands to your chest with your hands crossed, and hold for 20 times 10 second. Do two groups.

3. Shoulder extension: Turn your head 45 to the low shoulder side to stand upright, touch your back with your hands on the high shoulder side, and break your head with your hands on the low shoulder side. Stretch for one minute and do two groups.

4. Side waist stretching: the high-shoulder side leg is straightened 90 degrees, the low-shoulder side leg is retracted to the thigh, and the shoulder is pressed down to the high shoulder for one minute to make two groups.