Friends, there are many techniques in Hatha Yoga. In Shank Prakshalan, so much water is drunk that the bowel is completely cleaned. In yogic vomiting, the drunk water is pulled back from the stomach and out through the mouth. In Jal Neti, water is drunk from one nostril and taken out through the other nostril. The water in all should be lukewarm and slightly salty. In common language these actions are called cleaning actions, but in reality it is not so. Dirty things are cleaned. Our body is not dirty at all. Removing mucus is called cleansing, but a healthy person produces healthy mucus, which has many benefits for the body. Its coming out should not be called cleansing of the body. Saying this, one does not feel like doing these yogic activities. It seems that we were dirty before and are now being cleaned. I think that the meditation benefit that seems to be gained by taking them out is not from their coming out, but in its absence, from the touch of environmental substances with various body parts. This is a kind of effect like acupressure. When the inner surface of the stomach and intestines becomes bare due to the expulsion of mucus, then the touch of water and food etc. on it works as acupressure. Due to this, the Nadi sensation from their surface reaches the brain and activates it. Similarly, due to mucus coming out from inside the nose, the touch of air on its inner bare surface creates acupressure. Such acu points or Marma points (Sanskrit word for acupoints) are described on the outer surface of the body, but not anywhere on the inner surface. I think this also needs research. Naturally, even after vomiting, diarrhea or cold, one experiences similar freshness and a type of Kundalini samadhi. Probably, these healthy and artificial cleaning techniques have been created by copying them. Perhaps they have been called cleaning because such physical reactions at the time of illness help in cleaning. Because through these activities one feels samadhi i.e. purity of mind, perhaps this might have been confused with the purity of body, because mind and body are interconnected. Because perhaps such diseases arise to give the mind the benefit of samadhi, that is why it would be said that these activities do not let diseases to overcome the body defence. Therefore, in a healthy body their name should be Mind cleaning activities.
Similarly, there is a need for systematic research on Nadi also. If the form of Nadis were only so-called non-physical and subtle, then the Ayurvedic physicians would not have examined the Nadis by holding the wrist of the hand. Of course, we cannot experience the pulse or nerve directly, but we can definitely experience its physical and experiential effects. Its effect on the muscles is in the form of vibration, contraction etc. and its effect on the brain is in the form of thoughts. What is more, the physical functions which we consider to be happening without Nadis i.e. nerves and only under the influence of hormones, are also indirectly done by the influence of these. The hormone or enzymes producing cells are squeezed like a lemon by the power of nerves, due to which these biochemicals come out from inside them. I feel that the electrical line which is felt in the form of Sushumna Nadi from the perineum to the brain, is the vibration of the same which is felt in the form of a line due to the hyperactivity of the spinal cord. It creates vibrations in the form of a line in the spinal cord, and in the brain it is expressed in the form of a very clear, lively and stable mental picture, which is called Samadhi. From these things it seems that the experiential and physical effect of a nerve is called Nadi. Nerve fiber is a physical structure of the physical body, which helps in the transmission of messages in the body. If Nadi transmission is considered completely immaterial or miraculous, the disadvantage would be that man would become indifferent towards the healthy maintenance of his body. He will think that Nadi will become active only with special Sadhana. What happens is that one feels like doing sadhana only when one has a healthy body, and it is successful only with a healthy body.
Demystifying Kundalini 