Step in Time: Heighten your own awareness.
The correct head , neck and shoulders for the Central Nervous System(CNS) to function at it's optimum is critical.
The CNS consists of the brain and the spine.
So, when the upper body is incorrectly aligned due to poor posture arising from bad habits.There has to be a detrimental affect on the CNS as well as the musculo-skeletal structure - See below.
Strive to attain and then maintain good posture.
Step in time and stay comfortable.
The way we move is the only aspect of our lives we have total control of.