The aim of the work is to determine the correlation relationship between indicators of the anatomical state of the foot, functional disorders of posture and the level of physiological reserves of the cardiorespiratory system in students aged 17–20 years. Material and methods. 90 students aged 17–20 years are divided into 3 subgroups (30 students each): І - with a violation of the height of the arch of the foot, II - with functional disorders of posture and ІІІ - with simultaneous functional violation of the posture and arch of the foot. Anthropometric examinations of the spine, chest and foot were carried out, functional indicators of the cardio-respiratory system and blood gas composition were determined before and after the 6-minute walk test, to determine the level of cadiorespiratory endurance. Results. The study revealed a correlation relationship between the indicators of the anatomical and functional state of the foot and various types of functional disorders of posture, which consists in reducing the Weisflog index, increasing the width of the foot, Stritter and Stritter-Godunov indices, the longitudinal arch of the foot, I-toe and heel angle, and also between the types of violations of the kinematic pair of "spine-foot" and the level of functional reserves of the cardio-respiratory system. Students with lower than average and low levels of cardiorespiratory endurance after maximum physical activity show changes in the flow-volume indices against the background of an increase in hypoxia and a decrease in the acid-base balance of the blood. Сonclusions. The anthropometric parameters of the foot closely correlate with manifestations of functional disorders of the posture and blood gas composition after performing physical activity with 6-minute testing with walking, which can be used to diagnose the level of functional reserves of the cardio-respiratory system.