How many sets of radio gymnastics a ****

Since 1951, our country a **** introduced nine sets of radio gymnastics. These include the first set of adult radio gymnastics and eight sets of radio gymnastics for primary and secondary school students. These radio gymnastics were introduced in 1951 (first set), 1954 (second set), 1957 (third set), 1963 (fourth set), 1971 (fifth set), 1981 (sixth set), 1990 (seventh set), 1997 (eighth set). The launch date of the ninth set of broadcast gymnastics is not specified, but its existence can be inferred from the search results. Broadcast Gymnastics is a fitness method unique to China, in which group drills are performed through a radio conductor and musical accompaniment. Each set of radio gymnastics has its own unique characteristics and style, reflecting the social background and characteristics of the time. For example, the third set of radio gymnastics incorporates elements of martial arts, reflecting the characteristics of traditional Chinese culture; while the seventh set of radio gymnastics is influenced by the disco style, presenting a more modern and fashionable style.