Yoga makes you from the bottom of the lung louvres

People usually very shallow breathing, only the middle or upper lung inflation, but the majority of lung "end" of the lung, but no movement to the bottom of the lung, it is still lingering stale air of precipitation.

While precipitation is easier to grow bacteria of the air, such as cold, asthma, lung disease, and that is so.

So Yoga focuses on ease of fine and deep breathing, the lung can be inflated at the end, by the sedimentation in air expelled from the body, so that often people who practice yoga is not vulnerable to infections, and ratios generally healthy.