Breathing happens without our conscious effort. But there are certain breathing exercises like Pranayama that we do consciously, which needs to be done under the guidance of a professional master. Otherwise it will be dangerous.

Of course everybody breathes. But a very few do controlled breathing, which has the potential to keep your mind and body in a fit condition,

Breathing is always the positivness for body because it is all about  oxygen which is essential for living

just breathing will not have much effect. It has to be CONTROLLED Breathing. Like Pranayama in yoga.

Breathing is essential for all living beings, but proper breathing is necessary for good health. Take deep breaths so that oxygen reach to our stomach, it will help in proper digestion, but most people take breath such that oxygen reaches to lungs but not to stomach. So having controlled breathing gives you a good health.

Taking a deep breath is just one part. Slow exhalation and holding the breath for some time is equally important. It's called one cycle. Only then, you can reap the rich fruits of health.