Pranayama Breath Infusion Benefits
There are many benefits derived from breath infusion, the least of which is what one experiences as health improvements in the physical form. Overall, one gets more vigor in the physical form from doing breath infusion but a negative of that is that the body becomes intolerant of carbon dioxide and negative gases, so that one may feel shortness of breath or burning sensation in the chest if the body does not ingest sufficient fresh air to supply the cells with energy. In other words while in most bodies people do not notice anything if they are deprived of fresh air or have to work strenuously, the yogi will notice immediately that his cells are starved of it and the body will have hurt feelings here or there.
However, the big event is the subtle body. That is the main concern of a yogi. The first thing to notice is that if one does meditation immediately after breath infusion, the mediation will begin at a higher level. The mind will be more internalized naturally. It will have an interest in the introspective efforts. This is contrasted to if one sits to meditate without doing breath infusion prior. A yogi can test this by sitting to meditate each day for one week, at say 5am. Then rising early say at 4am to do breathe infusion before doing meditation immediately after. He can compare to see if the mind is much more internalized and is on a higher plane after doing the breath infusion.
Apart from achieving a level of pratyahar sensual energy withdrawal (internalization) from breath infusion, another important benefit in the subtle body is the responsiveness of the subtle energy to the will power of the yogi. One may find that during breath infusion, the energy of the subtle body can be compressed and expressed by pressures applied merely by will power, which is something that does not happen otherwise. The yogi can reach down in the subtle form and lift out energy from the lower parts of it merely by wishing to do so, because the energized energy from the breath infusion is submissive to the will power of the yogi. It does not resist his desire to move it here or there.
This is a different energy, a bliss force, as contrasted to regular feelings which one has in the subtle body but which are usually not responsive to the willpower.