INTRODUCTION: Breathing is one of the most important functions of our body, and we do not think about breathing at all because breathing is a spontaneous, unconscious, rhythmic mechanical process. The basic task of the respiratory organs is to bring atmospheric air into the lungs, where gases are exchanged between the inhaled air (oxygen) in the alveoli and the blood (carbon dioxide) in the pulmonary capillaries, according to the law of diffusion. DISCUSSION: The term “fitness maintenance” is commonly associated with maintaining a healthy cardiovascular system, regulating body weight, and reducing risk factors for various diseases, but exercise also helps maintain a healthy lung. During exercise, increased ventilation requirements result in increased nerve stimulation to the respiratory muscles. This causes increased mechanical strength developed by the muscles. Breathing is the hardest part of exercising because it is a mechanical, unconscious action, which is difficult to become aware of and incorporate into the exercise so as to allow the body to achieve better results. CONCLUSION: Proper breathing during exercise is an important goal to achieve the maximum effect of all types of exercises. . Although it is an unconscious and innate ability, it is not properly developed in most people. During exercise, it is always necessary to harmonize the rhythm and frequency of breathing with the performance of the exercise.