The volume expelled in one breath from inhalation to exhalation to the best of one’s ability while breathing calmly is called lung capacity, and increasing lung capacity slows down the decay of lung capacity, which in turn has the effect of prolonging life. When a person is in the process of strenuous exercise, they can inhale several times as well as a dozen times more oxygen than normal, however, during quiet times the alveoli begin to work, increasing the ventilation of the alveoli and enhancing the function of the lungs. Many diseases can lead to a decrease in the patient’s lung capacity, causing symptoms of dyspnea, and people who exercise regularly can increase their lung capacity to resist various diseases or aging brought about by the decline in respiratory function, but it is also important to note that you can not increase the lung capacity too much.