First, the content of aerobics The movements of aerobics are composed of a single movement, which comes from the movements of unarmed gymnastics, rhythmic gymnastics and dance. (1) The unarmed gymnastics movement is the most basic content of aerobics movement, which consists of the basic movements of head and neck, upper limbs, chest, waist and lower limbs, such as flexion, extension, rotation, winding, lifting, swinging and vibration. Only by mastering the movements of unarmed gymnastics correctly can it be possible to coordinate and accurately complete aerobics movements. There are great differences between unarmed gymnastics and aerobics in their completion methods, mainly in rhythm, direction, route and modeling. Because of the novel and unique hand shape and step shape, especially hip movements, aerobics movements are more colorful. (2) Rhythmic gymnastics unarmed action wave action is a typical action of rhythmic gymnastics. In addition, swing, circle, flexion and extension, balance, turn, jump, dance steps and approximate skill movements are also the contents of aerobics movements. Rhythmic gymnastics unarmed exercises can not only cultivate people's aesthetic feeling, but also effectively enhance their physical fitness, improve coordination and increase the difficulty value of complete sets of movements. (3) Simple action aerobics in modern dance absorbs a lot of movements of upper and lower limbs, trunk, head and neck and feet, especially hip movements in disco dance, jazz dance and thunder dance, which adds vitality to aerobics, but also helps to reduce the accumulation of fat in hip and abdomen and improve the coordination and flexibility of movements. In addition, many movements in folk dance, queue and formation changes in basic gymnastics are also one of the contents of aerobics. Second, the classification of aerobics Aerobics can be divided into two categories: competitive aerobics and fitness aerobics. Competitive aerobics is compiled, trained and competed according to the requirements of competitive aerobics rules. Aerobics is universal and there is no uniform requirement. (1) At present, there are roughly three kinds of competitive aerobics competitions: (1) National aerobics competition; (2) National Workers Aerobics Competition; (3) National College Aerobics Competition. Competitive aerobics has strict and unified standards in practice field size, number of practitioners, specific movements, movement rhythm and so on, which must be carried out according to the rules and cannot be changed without authorization. (2) Aerobics Aerobics aims at improving health and can be adopted by people of different ages in society. According to the needs of the practice object, the movement is simple, the rhythm is slow, and the time is different, and it can be arranged for 5 minutes to 1 hour. For example, jane fonda, a famous American aerobics star, compiled a set of primary aerobics for 27 minutes. In Japan, the general duration of aerobics is around 1 hour. At present, aerobics is widely carried out in China, and there is no uniform standard for the practice time, venue, quantity, content, action name and rhythm of each set of aerobics movements, which can be arranged according to the needs of practitioners. In addition to the above classification, aerobics can also be divided into the following categories according to certain characteristics: (1) According to the main purpose and task of exercise, it can be divided into mass aerobics and competitive aerobics; (2) According to the form of exercise, it can be divided into unarmed aerobics, light equipment aerobics and special bodybuilding equipment aerobics; (3) According to the gender characteristics of practitioners, it can be divided into women's aerobics and men's aerobics; (4) According to the characteristics of practitioners of different ages, it can be divided into infant aerobics, children aerobics, teenagers aerobics, teenagers aerobics, middle-aged aerobics and elderly aerobics; (5) According to the anatomical characteristics of human body, it can be divided into neck aerobics, shoulder aerobics, arm aerobics, chest aerobics, waist and abdomen aerobics, hip aerobics, leg aerobics and foot aerobics. (6) According to the characteristics of movements, it can be divided into body-building exercises, body-building exercises, running exercises and cushion exercises. There are many types of hand exercises commonly used in aerobics, which are developed from ballet, modern dance, disco and martial arts. Hand shape is the extension and expression of arm movements. If used well, it will make aerobics movements more colorful, lively and infectious. (1) convergence type: the five fingers are straight and close. The thumb is slightly bent and the knuckles are attached to the index finger. (2) Separate type: the five fingers are forcibly straightened and fully opened. (3) Ballet hand type: the five fingers are slightly flexed, the last three fingers are close together, slightly adducted, and the thumb is buckled. (4) Boxing style: clench fist, thumb outward, knuckles bent, forefinger and middle finger close. (5) Upright palm type: the five fingers are straight and the palms are forced upward. (6) Spanish dancer's hand type: five fingers exert force, the little finger, ring finger and middle finger bend from the metacarpophalangeal joint in turn, and the thumb is slightly buckled.