The second most well-known sport is undoubtedly rhythmic gymnastics. Gymnasts compete on the same floor mat, but their routines include the use of ribbons, ropes, hoops, and other apparatus. The trampoline was designated as an Olympic gymnastics category for the Summer Olympics in 2000. Gymnasts execute routines on trampolines, flipping on every bounce. They use their arms and legs to control the ball or ribbon and they can add acrobatics to their routines. Gymnastics has two disciplines: artistic and rhythmic. Artistic gymnastics involves individual skills performed on a variety of apparatus while balancing beams, balance bars, and rings are used in rhythmic gymnastics. Both disciplines involve athletic ability as well as technique. Artistic gymnasts must be able to perform difficult maneuvers such as back flips and twirls on high bars while rhythmic gymnasts need to be able to control heavy balls with only their bodies. Gymnastics is the second most popular sport in Greece after football. There are three types of medals awarded at the Olympic level: gold, silver, and bronze. All artistic and rhythmic gymnastics events award gold, silver, and bronze medals. In addition, there is a team event in which each country may enter a maximum of four athletes per gender. A nation's score in this event is based on the highest score achieved by any one of its athletes. If no athlete scores higher than 9.5, then the country will not receive a medal.