Hold dumbbells with both hands, put them on both sides of your body, and contract the muscles of your neck and shoulders to lift them, so that you can practice the muscles of your neck. But general bodybuilding does not advocate neck training, because neck training must hold your breath, which may easily lead to high chest pressure, which may cause danger, and there are many nerves and blood vessels in the neck. Neck training is easy to oppress, stimulate or even damage nerves, and may also oppress blood vessels, resulting in brain hypoxia.