Benefits of Deep Breathing Breathing is one of the only bodily functions we can take complete control over if we become mindful of it. The majority of the time, our breathing is on auto-pilot. When this is the case, we are typically not breathing to full capacity, taking very shallow breaths on each cycle. Optimal body function requires 100% oxygen. Optimal mental function requires 100% oxygen. If we expect our body and mind to function at their optimal capacity, it makes sen