This final paper deals with the application of monostructural activities to the development of functional abilities in pre-school children. Within sports activities the term functional capacity implies work of the cardiovascular and respiratory system, reception and transport of energy. These systems are most valued in order to carry out the task of supplying and transmitting oxygen. The aim of this study was to examine whether the activities in the field of athletics, with enhanced elements of walking and running, can and to what measure to improve the functional abilities of pre-school children over a period of three months. Adequate material conditions such as gym are not provided in the kindergarten where research was conducted and physical activities were carried out in nature at different weather conditions. The children were tested by initial and final examination, using 4 functional variables: Polygon 3 min (F3), pulse at rest (BPM1), pulse in activity (BPM2), pulse after exercise recovery after 5 min (BPM3). In the study participated 36 children from Bakar kindergarten in the age of 5 and 6. The experimental group consisted of 18 children from the "Škrljevo" facility while in the control group there were also 18 children, but from the "Hreljin" facility. After a period of three months, the experimental and control group results were compared. The obtained results fully confirmed the first and third hypotheses, no differences were found between the experimental and control groups in the initial screening and there was no improvement in functional abilities in children in the control group in the final test. The second and fourth hypothesis the results confirmed only partially. Therefore, differences in pulses and measured metrics between the experimental and control groups were determined and as the fourth hypothesis - there was a significant improvement of the results in the experimental group in the final test compared to the initial testing