Rhythmic gymnastics is a sport in which gymnasts perform individually or in groups on a floor with an apparatus: hoop, ball, clubs, ribbon and rope. The sport combines elements of gymnastics, dance and calisthenics; gymnasts must be strong, flexible, agile, dexterous and coordinated. Rhythmic gymnastics is governed by World Gymnastics, which first recognized it as a sport in 1963. At the international level, rhythmic gymnastics is a women-only sport.