Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.Synchronized swimming is a hybrid form of swimming, dance and gymnastics, consisting of swimmers (either solos, duets, or teams) performing a synchronised routine of elaborate moves in the water, accompanied by music. Synchronized swimming demands advanced water skills, and requires great strength, endurance, flexibility, grace, artistry and precise timing, as well as exceptional breath control when upside down underwater. Olympic and World Championship competition is not open to men, but other international and national competitions allow male competitors. Both USA Synchro and Synchro Canada allow men to compete with women. Competitors show off their strength, flexibility, and aerobic endurance required to perform difficult routines. Swimmers perform two routines for the judges, one technical and one free.as well as age group routines and figures.