When holding the exhaled breath out to a slight point of discomfort, the purpose of this exercise is to feel and track the subtle sensations that are created in the body. Please note that a slight discomfort is all that is needed to allow the mind to focus upon the very subtle sensations that are created.
As you inhale, notice the release of the slight discomfort and once again focus upon and track for as long as you can the very subtle sensations of release (the feel-good sensations) that are created.
When tracking fine sensations to their source, notice how the mind is able to focus deeply inside the body. This is an important point insofar as when you are aware of the mind connecting with subtle vibrations of the body, you now have a very different perspective on sensations that you may not have considered before.
There is also an acknowledgement that you have opened a pathway into the inner landscape of fine vibrations/sensations. Another way of considering this is that when you are feeling into fine sensations that you’ve not given much thought of before, then you’ve created a small “aha!” kind of experience.
This is a small “aha!” experience in the beginning because when you first feel into fine sensations, you will most likely also connect with what might initially feel like “intimations” of the primal vastness of vibrations that are just a hairbreadth below the surface of awareness!
The bigger “AHA!” experiences come when you start to feel the connectivity of sensations to the wider field of all vibrations. For example, the vibrations felt in the hands can be felt in relationship with the vibrations of the forearms, with the upper arms, shoulders, etc., etc.
With the big “AHA!” experience comes a noticing and acknowledgment of mind going into trance states, along with an allowing and surrendering of the body to move, dance and posture itself according to how the energy (life force) wishes to express in the body.