Breath is life. Meditating upon its presence is meditating upon our lives. It is the now, the present as it is. We can apply the skill in almost all the things we do daily. As soon as we bring our attention to the breath, the great power of observation comes to us naturally.
Due to the rhythmical change in the intracranial pressure, the brain gets a stimulating massage during bhastrika pranayama. The cerebrospinal fluid is magnetised, allowing the nerve impulses to travel faster up through the central nervous system.