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As an international competitive sport, competitive aerobics has been developed for more than 20 years. After joining the International Gymnastics Federation, events are frequent, competition rules are formulated and revised, and sports skills have made great progress. Since 1994, the International Gymnastics Federation has published four editions of competitive aerobics competition rules, including 1994- 1996, 1997-2000, 200 1-2004 and 2005-2004. In the first edition of Competitive Aerobics Competition Rules (1994- 1997), difficult movements are regarded as one of the three scoring factors of competitive aerobics, which are divided into six categories: dynamic strength, static strength, jumping, kicking, balance and flexibility, and the grades are determined according to the difficulty of difficult movements (0. 1- It is stipulated that the complete set of difficulty movements shall not be less than 16, and the sum of the highest difficulty scores shall be 16. In order to score in the competition, both Group E and Group F have extremely difficult movements, and the rapid development of difficult movements makes the competitive aerobics competition become more difficult. This phenomenon has aroused widespread concern and controversy in aerobics. It is generally believed that too many difficult movements will make aerobics lose its project characteristics and eventually become a sport for a few people. This should not be the development direction of aerobics and must be restricted. Therefore, in the second edition of Competitive Aerobics Competition Rules 1997-2000, it is stipulated that the complete set of difficult movements is 12 ~ 16, not exceeding 16, and the sum of the highest difficulty points of 12 is calculated. Where there is competition, there is competition. Although the number of difficulties is limited, the types of difficult movements have not decreased, but tend to be diversified. Each athlete chooses his own difficulties to compete. With the continuous creative completion of new difficult movements by athletes in the world aerobics championship, some difficult movements with high imagination scores are easy to be completed by athletes, so it is inevitable to adjust the difficult movements. Therefore, the third edition of Competitive Aerobics Competition Rules (200 1-2004) changed the difficult movements from the original six categories to four groups: Group A-push-ups, free fall, leg twirling and cutting; Group b-support and level; Group c-jumping; Group d-flexibility and change. In other words, it is more reasonable to combine the difficult movements belonging to the same type, which expands the scope of athletes' choice of difficult movements and is conducive to athletes' choice of appropriate action types according to their own advantages. And clearly stipulates that the number of difficult movements includes 0 points. Therefore, athletes must be very sure when completing difficult movements, otherwise a slight mistake may lead to 0 points for difficult movements, and at the same time, points will be deducted according to the mistakes in difficult movements when completing the referee. According to the rules of 200 1, points will be deducted for movements exceeding 12 in difficulty, movements lacking difficulty, movements exceeding 6 on the ground, and movements exceeding 2 push-ups landing. Therefore, in order to get high marks in difficult movements, athletes must choose different types and high levels of difficult movements, ensure the number of difficult movements and reach the minimum completion standard of difficult movements, which means that the selection of difficult movements must be diversified. The fourth edition of Competitive Aerobics Competition Rules 2005-2008 has not changed much in terms of difficulty, but four groups of difficulty names have changed: Group A-dynamic strength; Group b-static; Group c-jumping; Group d-balance and flexibility. In this way, actions belonging to the same type of difficulty are put together to make the grouping more reasonable. The new rules cancel the calculation of the difficulty coefficient of the original team athletes' gender problems, and the difficulty coefficient of three-person and six-person is the same as that of single and mixed doubles.