I was reading Spinal Breathing yesterday and suddenly had a visualization of the process of Yoga, and what the state we refer to as Yoga might be. I wish I could draw you a pic but I'll try to descibe it in words.
Lets think of ourselves as having a tube that runs vertically through our body. Essentially that's what we are -physically -when you think about it. Now there is also an energetic counter part to that which connect the root to the crown which AYP refers to as "spinal nerve".
For most of us the energetic tube does not allow for free flow of energy through it. The aim of AYP is to systematically dissolve these blockages which prevent the free flow of enery through it. So, slowly, as these dissolutions occur, the energy is able to move higher and higher. As it does, it stimulates different energetic centers. The stimulation of these centers as the energy passes through them, can manifest different ways as it corresponds to each center. For example, like many of us have experienced, as it moves up from the root upwards, one might feel slight sexual arousal. Perhaps, we experience "visions" or "flashes" as it travels up the higher centers in the head area. But these manifestations are only temporary, and last only as long as the energy is not able to move higher up.
This is where I had an epiphony. Lets think of the spinal nerve as an electrical switch which is part of a larger, universal, electrical circuit. Once the "energetic tube" aka spinal nerve is free of obstruction, energy is able to flow freely through it. Lets suppose that the flow of this energy is coming in through the root, flowing up and out through the crown and back out into the universe, to be sucked back in through the root, through the crown and back out into the universe all in one continuous, uninterrupted flow. The universal energy flows in through us, then back into itself. We become part of this universal energetic circuit. This is the state called Yoga. Union. One. One universal energetic circuit. Not seperate from us, but part of us, and us of it. Merged.
Only once the universal energy is able to flow freely though us have we reached the state of Yoga. Prana is everywhere, but we just take in a minute amounts. Once the "tube" is cleared, it's like turning on the prana tap full blast.
Trust me, it makes alot more sense with the pictures:)
I also am thinking that the reason why we should not get caught up in the sensations, visions, thoughts that are manifested is that by doing so, we hinder the upward movement of this energy. If we focus our attention on them, then instead of continuing to move up, it gets diverted and stagnates at that particular area where we are focusing our attention. For example, if we focus our attention on the "sexual" arousal, then by doing so we aer in fact keeping the energy in that chakra, thus feeding further manifestations in that center.
So, by simply coming back to the practice, we liberate it and allow it to continue its upward movement and allow the process to happen.
I visualise this very nicely, I wish I had the skills to make a Flash animation to share what I am seeing with all of you.