A balletina is a person who practices the art of classical ballet. Both females and males can practice ballet; however, dancers have hierarchy and strict gender roles. They rely on years of extensive training and proper technique to become a part of professional companies. Ballet dancers are at a high risk of injury due to the demanding technique of ballet. Ballet dancers begin their classes at the barre, a wooden beam that runs along the walls of the ballet studio. Dancers use the barre to support themselves during exercises. Barre work is designed to warm up the body and stretch muscles to prepare for center work, where they execute exercises without the barre. Center work in the middle of the room starts out with slower exercises, gradually leading up to faster exercises and larger movements. Ballet dancers finish center work practicing big leaps across the floor which is called grande allegro.