Allergic respiratory diseases are common in the pediatric population. In addition to conventional therapy, rehabilitation programs are increasingly being used, including breathing exercises in their protocols. Rehabilitation is usually done over 21 days under the supervision of a physiotherapist. This research is focused on breathing exercises as the leading physical segment of respiratory rehabilitation and the objectification of their impact. Materials and methods The respondents are school-age children (ages 7-18) with a diagnosis of allergic asthma or chronic lung disease. The research will be conducted on a total of 40 school-aged children, divided into two groups: test group (n=20) and control group (n=20), regardless of gender. The control group will be children who do not carry out the program of breathing exercises in the specified period, and in terms of other characteristics they correspond to the tested group. Breathing exercises will be assessed through spirometry and measurement of chest circumference with a centimeter tape. Measurements will be taken before the start of rehabilitation and after the 10th day of rehabilitation, i.e. completion. The results The results indicate that there is a trend of improvement in lung functions, especially FVC after 10 days of breathing exercises compared to the control group. Chest circumference at the beginning and at the end of rehabilitation did not prove to be statistically significant in terms of the expected increase in chest circumference. Conclusion Breathing exercises are an important factor in the respiratory rehabilitation of allergic lung diseases in children. 10 days of rehabilitation that includes breathing exercises is enough for a statistically significant improvement in lung forced vital capacity. Therefore, it is necessary to conduct research that would include longer rehabilitation and a larger sample of respondents.