This video goes into detail about the two head and neck postures outside of the normal range.

With the anterior head carriage neck posture, the head goes too far forward creating stress on the back of the neck. The tight muscles are usually the suboccipital, upper traps, pectoralis, and SCM. The weak muscles are often in between the shoulder blades and deep neck flexors.

With the military neck posture, the head is extremely upright. This can make for less shock absorption and more susceptible to neck pain. In this posture, the muscles in between the shoulder blades are too tight.

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