Rhythmic gymnastics is a sport in which gymnasts perform 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 the International Gymnastics Federation (FIG), which first recognized it as a sport in 1963. It became an Olympic sport in 1984, with an individual all-around event. The group all-around competition was added to the Olympics in 1996. At the international level, rhythmic gymnastics is a women-only sport. The most prestigious competitions, besides the Olympic Games, are the World Championships, World Games, European Championships, European Games, the World Cup Series and the Grand Prix Series. Gymnasts are judged on their artistry, execution of skills, and difficulty of skills, for which they gain points. They perform leaps, balances, and rotations along with handling the apparatus. Rhythmic gymnastics grew out of the ideas of Jean-Georges Noverre (1727–1810), François Delsarte (1811–1871), and Rudolf Bode (1881–1970), who all believed in movement expression, where one used to dance to express oneself and exercise various body parts. Peter Henry Ling further developed this idea in his 19th-century Swedish system of free exercise, which promoted "aesthetic gymnastics", in which students expressed their feelings and emotions through body movement. This idea was extended by Catharine Beecher, who founded the Western Female Institute in Cincinnati, Ohio, United States, in 1837. In Beecher's gymnastics program, called "dance without dancing", the young women exercised to music, moving from simple calisthenics to more strenuous activities. In 1885, Genevieve Stebbins published her first book, The Delsarte System of Expression. She went on to develop "harmonic gymnastics", which enabled late nineteenth-century American women to engage in physical culture and expression, especially in dance.