Breath- the vital energy source

Close your eyes for 1 minute.

And count how often you breathe in and out.

So breathe in, breathe out = 1

Breathe in, breathe out = 2 .... etc

(NO NO, DON'T READ ANY FURTHER JUST TRY)

And?

How often did you breath?

In general it appears that we breathe 16-18 times per minute. But did you also know that for optimal health of body and mind at rest (regardless of age) 6x per minute is the most optimal.
This is also referred to as resonance breathing.

Resonance, the scientific name that describes what happens when our heart rate, heart rate variability, blood pressure, and brainwave function come into a coherent frequency. It occurs spontaneously when we breathe at a rate of six breaths per minute (instead of our usual 15-18), and is the rate of breathing that Buddhist monks and Yogis naturally enter into while meditating.

The effects of resonance supports the innate ability of our body, nervous system, and emotions to restore themselves through the balancing of the complementary branches of our autonomic nervous system, which control our heart rate, blood pressure, digestion, respiration, and many other automatic functions of the body.

How is it possible for one breathing technique to do so much? The answer lies within our nervous system. By breathing at resonance, we enter into an even balance between the two branches of our autonomic nervous system, the sympathetic (which moves us towards activity) and the parasympathetic (which moves us towards rest). When the branches are out of balance, you are either always stepping on the gas or always stepping on the brakes. 

With our busy lifestyle, the first is more obvious and that also explains why so many people suffer from stress-related complaints. It is for that reason that the World Health Organization predicts that by 2030, mental complaints and disorders will form the largest part of health problems.

Fortunately, you can be in charge and actively make sure it to be different.

A nice and simple way can be to regularly pay attention to your breathing.
In the yoga tradition, this resonant breathing is achieved through the practice of samavritti.