Breathing is process very hardly notice, its going on continuously whether we are aware of it or not. Deep breathing is Conscious breathing where we are fully aware of our breathing. Nowadays more & more people are becoming aware of the Health benefits of Deep breathing.
Breathing is the only bodily function that we do both voluntarily and involuntarily. We can consciously use breathing to influence the involuntary (sympathetic nervous system) that regulates blood pressure, heart rate, circulation, digestion and many other bodily functions. Breathing exercises can act as a bridge into those functions of the body of which we generally do not have conscious control
When we are under stress our breathing pattern changes, it becomes rapid. That directly affects the working of our different body parts. Over a period of time frequent increase in heart rate takes toll of our overall health.