: Stand naturally. Close your lips and do aerobic rhythmic breathing exercises through your nostrils: short breaths-hold your breath-hold your breath-hold your breath-hold your breath-hold your breath-hold your breath-hold your breath-hold your breath-breathe out slowly and evenly. In the above-mentioned complete aerobic breathing rhythm, there are six consecutive short inspirations, six short pauses (breath holding time is 1~2 seconds) and one slow exhalation. Ten minutes of exercise between classes can eliminate brain fatigue, such as yawning and stretching. When students are tired of studying, they will yawn and stretch unconsciously. This is a protective physiological instinctive reaction automatically produced by the human body when the brain is tired, reminding you: "It's time to rest". Yawning can increase the oxygen supply to the brain through oral movements, and stretching can quickly improve the blood circulation system of the whole body and enhance cardiopulmonary function. During the break, students can consciously do twenty or thirty yawns and stretches, yawning hard and stretching hard at the same time, which can quickly clean up the brain, activate thinking and enrich the brain. When yawning and stretching, you should pay attention to the following points: ① When yawning, open your mouth hard and relax your neck as much as possible. 2 when stretching, you should hold your chest hard, expand your chest and straighten your waist and abdomen. 3 yawning and stretching should be carried out at the same time, so that the effect of eliminating brain fatigue is more obvious. ④ After yawning and stretching every time, relax for a few seconds and do it again. British scientists have made a detailed observation of isotope flow in blood circulation by using isotope tracker, and found that yawning and stretching can really increase the blood supply to the brain and increase the oxygen demand of brain cells' thinking activities, so that some scientists once said that yawning and stretching are two good exercises for human beings to eliminate brain fatigue. "Students who can't rest won't learn better", what a wonderful learning motto! Brain physiology tells us that long-term excitement of cerebral cortex will inevitably lead to excessive inhibition. It is precisely because in the sprint review of senior three, the brain is in a state of overwork and intense work all day, so students should pay more attention to the ten-minute break between classes and cheer for the brain. The best way to have a rest between classes is to do some light physical activities. What light sports actions can quickly eliminate brain fatigue? Recommend the following physical exercises to the students. These brain-strengthening exercises are carefully selected by sports experts from more than 420 kinds of physical exercises, and their refreshing value is very high. 1. Head movement: ① The head leans back slowly and gently, and the neck relaxes and leans back until it can't be lifted any more. (2) The head is slowly and gently lowered forward until the chin is close to the chest. The above two movements are relaxed, gentle and continuous, and the number of exercises can be controlled freely. (3) Bow your head slowly and gently to the left, and the head is so low to the left that it seems to be close to the left shoulder. (4) The head slowly and gently bows to the right, and the right down to the head seems to be close to the right shoulder. The above two left and right bows are relaxed, gentle and continuous, and the number of exercises is freely controlled. 2. Quick squat: ① Quick squat, and then stand up straight. Squat to the extreme, stand completely straight, and move quickly and rhythmically. Exercise time is free to master. (2) After finishing the quick squat easily, you can increase the amount of exercise and stand in front of the wall (tiptoe slightly close to the wall or stick to the heel of the wall) to make a soft and relaxed squat. Never throw your head back when you stand in front of the wall and do squats together. Exercise time is free to master. Squatting together mainly exercises hips, knees, ankles, waist and abdomen, which is very helpful to relax the systemic reticular blood circulation system, enhance vitality and refresh the mind. 3. Bending action: ① Curling from top to bottom from head to cervical vertebra to thoracic vertebra to lumbar vertebra. (2) From the lumbar vertebrae to the thoracic vertebrae to the cervical vertebrae to the head, arch and straighten from bottom to top. The bending action is different from the usual bending action and waist pressing action in physical education class. Physical education class's waist pressing action is to press the waist straight down to open the back ligament. This bending action is to curl the trunk from top to bottom, and then straighten it from bottom to top. It focuses on the dorsal artery. The back of the human body is a place where arteries and blood vessels are very concentrated. When students do a lot of physical exercise, they obviously feel that their backs sweat the most. The arterial blood vessels in the back directly enter the brain and are connected with the cerebrovascular microcirculation system. Bend over and exercise freely.