It often feels entirely effortless, but that doesn t mean breathing is simple: There are about 10 pounds of muscles surrounding your lungs that help you inhale and exhale at least 17,000 times a day. Some of these muscles you re familiar with, such as the diaphragm; others you may have never heard of, like the intercostals, located in the spaces between your ribs. They all work in synchrony to bring oxygen into your body and expel carbon dioxide. This process not only keeps you alive but also affects your digestion, blood pressure, mood, cognitive function, athletic performance, even your immunity and experts believe that
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