Modern handball is a polystructural complex activity that is played on a field measuring 40 x 20 m. It is a sport in which high-intensity running, changes of movement direction, throws and one-legged and two-legged jumps prevail. It contains natural forms of movement such as running, jumping, throwing, falling, etc. Due to the high variability of movement, handball is one of the most complex sports activities. The dominant factors of success in handball are strength, endurance, speed and coordination. With regard to sports specifics, endurance can be divided into general and specific endurance. General endurance is the performance of an activity over a long period of time in which numerous muscle groups and systems are involved. Specific endurance depends on the characteristics of a particular sport or the motor actions we repeat during its performance. Humans have a great capacity for endurance, and we can increase it by influencing the will to overcome the weakness that can result from fatigue. Endurance is the characteristic of an athlete to maintain working ability for a long time. We can define it as the ability to perform activities for a long time where the occurrence of fatigue does not significantly affect the intensity of work. Therefore, it is important to psychologically prepare athletes during training so that they can tolerate the pain of training and competition. Endurance training is based on two training methods: continuous and interval training methods. Basic variants of training are continuous methods with standard and variable load. Standard load historically came first. Later, a continuous method with a variable load, or fartlek, appeared. The interval method of training has a great advantage over the continuous method of training. This means the possibility of more precise dosing and regulation of load parameters. This enables better training programming. Sports training is carried out in stages called cycles. The annual training cycle is planned within one or more training macrocycles. Each microcycle consists of a preparatory, competitive and transitional period. The preparatory period is a mesocycle in which we achieve training effects by applying appropriate programs for the development of all factors of success in sports. The main goal of the competition period is the improvement and improvement of the technical-tactical form and the development of endurance. We achieve this by optimal dosage of workload with adequate rest time. The transition period is the shortest period of each macrocycle. The goal in this period is the regeneration of the athlete's organism after the competition season. There is a reduction in the training load, and active rest prevails.