Theoretically, all teaching staff related to physical education should master the technique of cardiopulmonary resuscitation. This is because the gymnasts in the gym are often people who usually lack exercise, and some people even have basic diseases that they don't know. If they start exercising without any warm-up activities, it may have a great impact on the cardiovascular system of these high-risk groups and lead to cardiac arrest. At this time, the coach is the first witness and the most important rescuer. This is why coaches need to master CPR and pass the exam.