Grace and harmony are needed to shine in this sport which became an Olympic one in 1984 and is reserved for young women. This contest is in some ways similar to the water ballets once made popular in the Esther Williams films.The shows of the past have given way to a genuine sport that requires great physical abilities. Now underwater cameras allow the audience not to miss any part of the swimmers' performances. It should be pointed out that pairs are often made up of sisters or even twins since this undoubtedly represents an advantage. They effectively have the same facial expressions, the same dimensions and sometimes identical gestures, factors which clearly play a role in the overall evaluation.