The centermost “channel” of the spine, when focused upon and deeply felt, creates a unique sensation and effect in the body. The sensation is like a fine thread vibrating inside the spine, which in turn activates the body to move in certain ways in order to accommodate the buildup of energy (the awakening Kundalini) in the spine and body.
Some of these adjustments are done in “micro-movements.” Perhaps a very slight twist of the neck or spine, or a subtle contraction of particular muscle groups, etc. These slight adjustments are activated by the body’s natural and intuitive response to the increased flow of energy (Life Force) in the body.
It is very much like a dance and play of fine energies in the body (and especially in the spine)! The visceral experience of this “dance” can only be described in metaphors… like “Divine Nectar” being squeezed through the spine and every cell of the body!
To me, this internal “squeezing” of energies seems to be a refinement process, one that distills “essence” from the breath and body. The “squeezing” movements, the push/pull contractions and expansions of the Life Force (Kundalini) is all a play and dance of energies that resolves to a most delicate balance of body, mind and psyche!