2./kloc-At the beginning of the 0/9th century, the parallel bars have become popular fitness equipment in Europe, and were later molded into gymnastics equipment by German gymnast F.L.Yang.. 18 12 has become a traditional exercise program in German gymnastics schools. /kloc-in the middle of the 0/9th century, the theory of Swedish gymnastics schools flowed into Germany. H. Rotstein, principal of the Royal Central Sports School in Berlin, who studied gymnastics in Sweden, thought that horizontal bars and parallel bars were harmful to teenagers' physiology, and excluded the traditional German horizontal bars and parallel bars from gymnastics teaching. There was an argument about 1860. Three people from Berlin Gymnastics Federation wrote a letter to protest against the cancellation of singles and parallel bars. 19 doctors, including medical counselors, specially studied and thought that parallel bars conformed to human physiological characteristics. Germany's highest medical institution accepted the latter's statement, and since then, the parallel bars have gained a firm foothold in gymnastics. Since 1 Olympic Games, parallel bars have been listed as gymnastics events.