Normal adult breath holding time is about 40 seconds, and some people can hold their breath for more than 1 minute. The length of breath-holding time is related to the size of one’s lung capacity, one’s tolerance to oxygen deprivation, and one’s physical condition. 1. Lung capacity: the length of breath-holding time is related to one’s own lung capacity. People with large lung capacity hold their breath for a long time, while people with small lung capacity hold their breath for a shorter time. 2. Tolerance to oxygen deprivation: the length of time to hold your breath has a relationship with your own tolerance, such as the heart, brain, kidneys, these parts of the oxygen deprivation is more sensitive, if the time to hold your breath is too long may lead to the corresponding parts of the ischemia, chest tightness, chest pain, dizziness, headache and other symptoms. 3. their own physical condition: the length of time to hold their breath and usually exercise the body has a relationship, often exercise the body of the people in better physical condition, lung function is better, hold their breath time will be longer, the lack of exercise in the people hold their breath time is generally shorter. Therefore, the time to hold your breath varies from person to person, mainly reflecting the strength of lung function or ventilation and air exchange function, usually pay attention to exercise, increase lung capacity.