Water polo is one of the oldest team sports, and it has been included in the Olympic sports since the very beginning of the modern Olympic Games. Looking back, the rules of water polo were constantly changing. We can see that throughout history, water polo has developed especially in the direction of speed, strength and speed endurance. According to its energy representation, water polo belongs to the group of sports in which the dominant place in the field of functional abilities is occupied by aerobic-anaerobic potentials and capacities with an emphasis on specific lactate endurance. The game of water polo is characterized by specific features such as the emphasized collision of opponents, the high intensity of the overall activity and the synergy of individual, group and collective actions. Water polo requires players to have a high level of coordination, reaction speed, frequency of movement, speed of one movement, explosive power, repetitive power, agility and developed aerobic and anaerobic capacity. The goal of this work is the development of anaerobic endurance in the preparatory period. Considering the intensity and volume of the load during a water polo match, experts assume (Dal Monte, 1983) that 30% of energy is used from anaerobic-lactate energy processes, and 40% from anaerobic-lactate energy processes, while the other 30% comes from aerobic energy process. From this data, we see that anaerobic endurance is dominant in water polo.