Let me introduce you to the small method of restoring your arm. Find a chair and put the back of your hand on the edge of a solid chair. Slide your thighs off the chair and support your weight with your hands. Straighten your right leg and bend your left leg 90 degrees. Bend your elbows and slowly lower your thighs to the ground. Keep your elbows bent and your body at a certain distance. Pull your body back until your arms are straight. Don't help you with your feet. Do it 8 to 15 times in each group, straighten your left foot and do it again.
There is standing posture, hands drooping naturally, feet shoulder-width apart and a towel. Fold the towel in half and hold both ends with both hands. Stretch your hands up, then move to the right, bend your elbows, pull hard with your right hand, and pull your left hand over to make the muscles inside your left arm feel tight, and then return to the straight action. Move your hands to the left, bend your elbows, pull your left hand hard, and pull your right hand over, so that the muscles inside your right arm feel tight, and then return to the straight action. You can do it interactively four times. Due to the use of assistive devices and large pulling action, be careful not to overstretch, so as not to strain your arm.
Wish: health and happiness!