Ballet is a dance that has existed for more than a century.It originatesfrom France and Italy. In the past, there were different understandings and views on the desirable characteristics of a ballet dancer. Due to too much emphasis on aesthetics and elegance, the components of dance training, such as strength training, were often neglected and thus the health of the dancers was damaged. Today, attitudes are different because ballet and dance are generally seen as any other sport that havetheir own physiological requirements. The total expenditure of energy during ballet practice is very high. Therefore, the development of the conditions of a classical ballet dancer is as important as the development of skills in order for the dancer to be able to meet the demands of the choreography. In addition, flexibility is very important, as well as a favorable composition of the body mass, which will enable the performance of strenuous choreographies. In order to prevent injuries of a dancer, it is necessary to include all necessary components in dance training, both flexibility training and strength and endurance training. The most important thing should be the dancer's health, not aesthetics. The paper shows the physiological demands of ballet as an aesthetic sport, and what is expected of professional ballerinas and ballet dancers in a physiological sense.