Allow for a softening in the back of your neck.
Of course there is no real position for your head because your head should be constantly available for movement. More of a problem is that the head is held too tightly and almost stuck in a position. Allowing for a release of the muscles in the back of your neck will allow your head to rise a little bit, giving more room to your spine, which in turn can make every movement easier. Without moving your head around, try it with just a thought.
More on a softer neck:
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