The specific action is: the little finger bends inward, then pulls back, doing flexion and extension movements 10 times. Grasp the center of the little finger root with your thumb and forefinger and knead it 10 times. Press the little finger on the table and stimulate it repeatedly with your hands. Hands clasped with fingers crossed, and then suddenly pulled away. Stimulate the center of the palm (palm) and pinch it 20 times at a time. Rub the tip of your middle finger frequently for 3 minutes at a time. You can choose two or three of the above methods to use alternately every day. It can increase the blood flow of the brain, activate some sleeping brain cells and train the coordination function of the brain. You have to persist to see the effect.