It is known that representatives of different somatotypes have different training effects. The cardiovascular system is a limiting factor in the body's ability to exhibit aerobic and anaerobic lactatic productivity. Peculiarities of adaptation of the cardiovascular system of women of the first mature age of different somatotypes to recreational swimming classes were investigated in a fragmentary manner. 80 women aged 25-35 who had no experience in physical education and sports took part in the study. Swimming classes were held 3 times a week. The swimming program is focused on stimulating mainly the aerobic energy supply system. For the purpose of harmonious development, anaerobic exercises were performed in the second half of the main part. All subjects were conditionally divided into groups according to somatotype. Somatotype was determined by the Heath-Carter method. A decrease in heart rate and systolic blood pressure after dosed exercise was found in a group of women of different somatotypes and in a group of representatives of the endomorphic somatotype. In representatives of ectomorphic, endomorphic- mesomorphic and balanced somatotypes, there is a tendency to decrease heart rate and blood pressure after dosed loads. Such adaptation reactions are considered positive. Adaptation reactions of women aged 25-35 years under the influence of classes of health-improving swimming were manifested by a decrease in heart rate and systolic blood pressure after dosed physical exertion. Among representatives of different somatotypes, women of the endomorphic somatotype have more pronounced adaptation reactions of the cardiovascular system.