VO2max represents the performance of the organism's oxygen-absorbing, oxygen-transporting and oxygen-utilizing subsystems. The more blood is transported by the heart per minute and flows through the circulatory system, the more O2 is absorbed from the air we breathe into the blood by means of gas exchange and transported to the working muscles. The maximum oxygen uptake capacity therefore reflects a person's cardiorespiratory performance. It is therefore an important parameter for assessing aerobic endurance performance potential.