The sensing of fine and subtle vibrations moving through the the body (and especially the spine) imparts an experience of immense sweetness…like a kind of delicious nectar moving through every cell of the body!
Again, as mentioned previously, there is no difficulty in connecting/feeling into this blissful vibration. In my experience, when first connecting deeply with the subtle vibration, I was amazed at the infinitely thin layer of separation I created through my own resistance to feeling deeply…in not considering the simple invitation to follow the trail of feelings to deeper and finer levels of subtlety.
I was also amazed at how many years (and perhaps lifetimes) I struggled in meditation to connect with what was, ironically, so very close! The “problem” was not in meditation technique or in any lack of trying, but in not truly “getting,” understanding the import of feeling into subtle sensations…which is so very accessible to anyone!
Another important aspect of feeling into subtle sensations is in noticing/acknowledging of the buildup of the energy in the areas where the sensations are tuned into. It seems that wherever the sensations are focused upon, there is an expansion of the energy…creating energetic currents moving through the body/spine.
You might then notice how the body may adjust in “micromovements.” Twisting, coiling, contorting, etc., as a way to manage the higher voltage of life force in the body.