2. Raise your arm above your head. Stand up and keep your waist straight. Next, when you raise your hands, bend your elbows slightly and push them slowly to the top of your head. This process is like moving things. A series of lifts can exercise arms and shoulders, and can play a role in slimming arms and shoulders.
3, lateral shoulder external rotation. Lie on your side on the yoga mat with your arms as close to your body as possible. In this process, your elbow needs to be bent. Then wrap the forearm around the elbow outward until the arm feels hot and sore, and then do the same exercise on the other side. This is called lateral shoulder external rotation, which is very helpful for thin shoulders and thin arms.