Hey,
I've introduced spinal breathing to my routine, just a couple of minutes per session before meditation.
I've noticed on the inhale, as the attention comes up into the head, that there is some difficulty in turning attention forward towards the third eye. In fact, it feels like some energy goes straight up to the crown chakra, involuntarily.
Just thought I would mention this - any need to 'do' anything, or just keep on keeping on?