Yawning is only seen when the human body is tired, yawning is mainly a lack of oxygen to the brain, through yawning can be deep inhalation, the lungs into more gas, to relieve the central nervous hypoxia symptoms. Of course, some people have poor physical quality, even without exertion will also appear yawning, then we have to increase the body’s tolerance for hypoxia. This can be done by strengthening nutrition, in addition to strengthening exercise, especially aerobic exercise, such as sprinting, badminton, swimming, to increase the body’s tolerance for hypoxia, the symptoms of yawning will be significantly improved.