Synchronized swimming is an aquatic sport that combines elements of swimming, dance, and gymnastics performed to music. Swimmers perform a series of coordinated moves both individually and in groups. The sport originated from water ballet in the early 20th century and became more standardized and competitive over time. It became an Olympic sport in 1984. Competitions require swimmers to perform technical and free routines that are judged on synchronization, artistry, and difficulty of maneuvers.