Avoid the overtraining! The main symptoms of overtraining are: - decrease in muscle size - decrease of force - trouble sleeping at night, insomnia - post workout recovery period is much higher than usual - a sensation of fatigue persist - loss or decreased appetite and it can be an important symptom - the appearance of joint and muscle pain - low concentration in training - lower immunity Symptoms, most of them, occur over time not all at the same time. Which makes it very difficult to determine if an individual is overtraining or not.