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The fixed bar in artistic gymnastics, exclusively for men, is a device where gymnasts perform rotating movements in an acrobatic routine. Credited to Friedrich Ludwig Jahn, it has been present at the Olympic Games since the first edition. Originally called a horizontal perch, it evolved with innovations, such as the inclusion of starts and restarts. The material is similar to that of women's asymmetrical bars, with malleability for gymnasts' safety. Palm protectors are used to prevent injuries. A good event requires several acrobatic elements and discounts are applied if gymnasts do not meet the minimum requirements. Movements on the chin-up bar include the cubital grip, support, support kippe and überschlag.