Stand up easily and casually, then put your hands and fingers crossed behind your back and hold your chest out. Keep your hands crossed and your arms raised as high as possible. Hold this position for about 7 seconds. Repeat 5- 10 times.

The right arm is at 90 degrees to the elbow, and it is attached to the back. The palms are open and the palms are outward. Grab your right wrist with your left hand and pull it to the left. Hold this position for about 7 seconds. Repeat 5- 10 times. The left and right hands can take turns to do this action.