There were studied individual typological peculiarities of the genesis of the genesis of 15-17 years old boys, the state of their respiration and their heart activities. According to these experiments there was stated the possibility of the complex appreciation of the biological tempos of genesis of the senior grades' pupils on the bases of physical and somatic genesis and sexual maturity. As a result of such differentiation of 15-17 year old boys there will appear 3 typological groups--fast, normal and slow types of genesis which quite differ by the majority of grades. Besides these 3 groups differ by the functioning of cardiorespiratory system. Boys with fast tempos of genesis are closer by the functioning peculiarities of cardiorespiratory system to the normal tempos of genesis which are understudy. The group with the slow genesis is quite different from the groups with the fast and normal genesis.