jumping in Nias. Stone jumping involves leaping over a stone wall about up to 1.5 m high and was originally used to train warriors. Pencak Silat is another popular form of sport, which was influenced by Asian culture as a whole. Another form of national sport is sepak takraw. The rules are similar to volleyball: to keep the rattan ball in the air with the players' feet. Popular modern sports in Indonesia played at the international level include football (soccer), badminton and basketball. Badminton is one of Indonesia's most successful sports. Indonesian badminton athletes have played in Indonesia Open Badminton Championship, All England Open Badminton Championships, and many international events, including the Summer Olympics and won Olympic gold medals since badminton was made an Olympic sport in 1992. Rudy Hartono is a legendary Indonesian badminton player, who won All England titles seven times in a row (1968 through 1974). Indonesian teams have won the Thomas Cup (men's world team championship) thirteen of the twenty-two times that it has been contested since they entered the series in 1957. In the internationally popular sport of football (soccer), Indonesian teams have been active in the Asian Football Confederation (AFC). Sporting events in Indonesia are organised by the National Sports Committee of Indonesia (KONI). The committee, along with the government of Indonesia, has set a National Sports Day every 9 September with "Sports for All" as the motto. Indonesia has hosted the Southeast Asian Games four times, in 1979, 1987, 1997 and 2011, and won the overall champion title in each of these years. As of 2011, Indonesia has won champion titles 10 times overall out of 18 SEA Games it has attended since debuted in 1977. The country also hosted the 1993 Asian Basketball Championship. Besides that, it has also hosted the Asian Games twice, the 1962 Asian Games and the 2018 Asian Games. Popular media Cinema The largest chain of cinemas in Indonesia is 21 Cineplex, which has cinemas spread throughout twenty-four cities on the major islands of Indonesia. Many smaller independent cinemas also exist. In the 1980s, the film industry in Indonesia was at its peak, and dominated the cinemas in Indonesia with movies that have retained a high reputation, such as Catatan Si Boy and Blok M and actors like Onky Alexander, Meriam Bellina, Nike Ardilla and Paramitha Rusady. The film Tjoet Nja' Dhien (1988) winning 9 Citra Awards at