Draw a circle with both hands. We can do this action when watching TV. First, we hold our hands vertically in a straight line, and then we start to draw a circle with our hands behind our backs. There is no time limit. As long as you can do it, you can do it in your spare time, which can effectively reduce butterfly sleeve. In vertical stroke, put your fists on your hips, palms facing yourself, elbows bent to both sides, fists under your arms, elbows slightly higher than your fists, shoulders pulled back hard, upper back muscles pulled hard, elbows pushed back as far as possible, and fists raised to shoulder height. Finally, put down your hands and rest, and do it 25 times.