Overtraining syndrome occurs as a result of excessive burden on the body, as well as lack of rest and adjustment to physical stress. This means that we have not given the body and branch enough time to adapt and recover from training, or we have simply overdone and burdened the organism. Most often it happens in a period when an athlete or recreational athlete acquires a certain form, so he has ambitions and desires to progress even more, the sooner the better. We define fatigue as an inability to maintain the necessary muscle power to continue musculature in a given intensity. The term fatigue is usually used to describe decline in muscle performance in conjunction with exertion accompanied by general sensations of fatigue. For advancing in the training process, a proper rest is an indispensable component. Progress occurs when we give the body sufficient time to move the mechanism of the tendency to return to homeostasis, after training stress, initial abilities or morphological characteristics to the positive. We call this phenomenon supercompensation. Retraining is a state of fatigue , exhaustion and inability to perform training at the level the athlete was at before he retrained. Overtraining occurs due to the discrepancy in the intensity of the training and the time it takes for the organism to recover from it. This condition is accompanied by psychological disorders such as depression, anxiety, apathy, sudden mood swings and the like. Injuries of chronic type in the form of microtrauma occur as a result of repeated misconceives of movement or excessive use of a certain musculoskelete unit. In return for recovery from over-trained syndrome or injuries of a chronic type, the individual must follow strict instructions and give the body sufficient time to recover.