A complete breathing includes inhalation and exhalation movements. Normal adult breathing in a quiet state is smooth and even, with a normal frequency of 12-20 times/minute, which means that the normal time for a complete respiratory movement is about 3-5 seconds. The time required for respiratory exercise is affected by a variety of factors, such as strenuous exercise when the respiratory exercise frequency is often faster, the fastest up to about 60 times / min, when a complete respiratory exercise time required for about 1 second. The normal respiratory rate varies among different groups of people. For example, newborns often have a higher respiratory rate of 40 to 44 breaths per minute, and a single respiratory movement takes about 1.5 seconds. If you have abnormal respiratory rate or other discomforts, you should consult a doctor in time and do not make any judgment on your own, which may lead to adverse consequences.