Stamina is the endurance and staying power of the muscles, heart and breathing. In order to maintain a high standard of performance and technique, stamina is needed as it ensures that the heart and lungs are able to get oxygen to the muscles through the blood, to enable them to function to their maximum capability.
Stamina is both muscular and cardiovascular endurance. Muscular endurance is the muscle’s ability to continue contracting over a given time. It can be developed by progressive overload, which also increases the muscle’s strength, and this also helps the endurance of the muscle. During a ballet class, when working on technique, the repetitive movements will improve muscular endurance. Cardiovascular endurance is the ability to continue aerobic respiration and exercise over time. During exercise the heart rate increases from its resting rate to its maximum rate. After exercise it then returns to its resting rate. In a ballet class the heart is not usually at its maximum rate for long periods of time, for the exercises rarely exceed more than three or four minutes, and if doing a travelling sequence, a dancer would cross the floor once, or do an exercise once, then wait for others to do so before repeating on the other side. Therefore aerobic activity is not continued for long enough, so it recommended that a dancer should do some other aerobic activity outside of the class, such as running in order to increase their aerobic fitness and overall stamina.
During exercise the breathing rate also increases. This is so that the oxygen is supplied to the muscles faster and the carbon dioxide is taken away quicker. Aerobic exercise increases the long-term endurance of the respiratory system, where anaerobic exercise increases the short-term endurance.