Synchronised swimming is a type of swimming that looks like a dance in the water. It has very specific movements and routines that require practice and careful attention to timing. There are usually two or more swimmers in a routine, but sometimes there are also teams of eight or more people. The swimmers have to move their arms, legs and head at the same time in a certain rhythm, and often the pool is filled with music for the swimmers to follow. It takes a lot of practice to get the moves just right and the swimmers have to make sure their bodies are in the correct position or it won't look good.