It is shown the influence of the training loads of the different provoking the development of the sportsmen's aggressiveness. 324 aged 13 - 16 sportsmen took part in the experiment and 62 pupils of the comprehensive school of the same age, the latter ones never going in for sport. The anonymous tests were contracted at the beginning of the school year. The analyzed results of the longitudinal researches conducted by us in the 90s and 2000s. The fact of the specific influence of the training sessions leading to developing the aggressiveness was proved.