I can feel from time to time the my torso becomes more erect and my head, neck, and shoulders release and become separate from the spine and ribs. The muscles relax, the head and neck go up, and the shoulders spread and release.
michael young's blog
I've started feeling that my sacrum is being compressed and also it feels suspended it is in an omnidirectional hammock.i
Something I forgot to mention in one of my previous posts is that along with the smile there is a feeling of expanding laterally. The neck, the skull and sinuses, the chest, and the hips. This lateral expansion is one of the primary conditions that lead to a feeling of openess inside.