Pran enters the body through nostrils. Respiration maintains life and is the basis of Pranayam. According to Yogdarshan. It has been said that when you sit in one of the convenient posture (Asan) and regulate the act of respiration, it is Pranayam. The act of inhaling air in the body so as to reach the lungs, is called inspiration and the act of throwing the air out of the body, is called expiration. When we inhale, it is not only the air or oxygen that enters our body, but alongwith the air also enters a divine energy which keeps the body alive. Doing pranayam does not mean only taking the air in the body (inhalation) and throwing it out (exhalation), but alongwith oxygen, we also take in our body the Vital Energy. This Vital Energy permeates the entire universe and what we inhale and exhale is the fragment of it.
Swamiji has exhumed the Indian ancestral science of Pranayam from the grave of darkness, fear and monopoly of a few and presented it in its simplest form for the welfare of the mankind. Swamiji has devised a sequential practise of the 7 Pranayams with allotted time periods for each which has become very well known. Millions have benefited from this simple package of breathe-control exercises. Across strata from business establishments to government organisations, schools, colleges, judiciary, legislature etc. people have taken to pranayam under Swamiji’ s tutelage. It has become common place to see pranayam being practised at parks & gardens all over the country morning and evening.
As Manu Maharaj- the law giver of the Aryans is of the opinion that pranayam clears the body and mind as the fire cleans dross elements contained in the gold when heated. Physiology teaches us that the oxygen (Pran) we breathe fills our lungs, spreads in the entire body (internal and external including neurons, veins and arbitraries) providing it with essential food, energy, oxygen and gentle massage. Not only that the veins collect the dross elements form the body, take them to heart and then to the lungs, which throws the useless material like carbon-dioxide and other fatal toxins out of the body through the act of exhalation.
Through pranayam and Meditation we attain a transcendental state of consciousness where the mind has no thoughts or impressions. In that state, our neuro-enodrine system becomes limbic-hypothalamsu, pituitary, adrenal axis becomes strong and precise. As a result our stress hormones- ACTH, cortisol and prolactin and adrenaline and noradrenaline go down. And good hormones like beta endorphines and enkaphalins, etc., go up. As a result stress-related diseases like htn, D.M, obesity and heart disease, etc., start reversing.
So are the cases of diabetes, asthma, bronchitis, leucoderma, depression, parkinson, insomnia, migraine, thyroid, arthritis, cervical spodalities, hepatitis, chronic renal failure, cancer, cirrhosis of liver, gas, constipation, acidity etc.
Spiritually speaking, with the support of respiration that the mind peers into the inner world and enables the Sadhak (Practitioner) to experience divinity. It is with the objective that saints and sages of ancient times formulated different methods of Pranayam. The question that arises is what is the spiritual benefit that can be derived from practice of Pranayam.that on acquiring proficiency in the pranyam, Chitta becomes free from ignorance, mind is covered by radiant light of knowledge of ultimate reality.