Laughing in a good mood can strengthen a person's myocardial contractility. When people laugh, the muscles of hands and feet also move together, which promotes the metabolism of the body and improves the immunity of the body during the operation of external oxygen inhalation and accelerated internal blood flow. The blood circulation becomes smooth, which can accelerate the elimination of toxins in the blood, and the sugar and fat in the human body can be decomposed faster. At the same time, due to the smooth blood circulation, nutrients are transported to the peripheral skin, thus discharging the deposited waste and improving the skin, which has a natural beauty effect.