Have you ever noticed when you go past the shop windows your head sitting forward from your shoulders?
It is a common problem which can lead to all sorts of neck and shoulder problems. This "poor forward head posture" shortens and tightens the big outer muscles in the neck and weakens the deep postural muscles.
This exercise below should stretch the tight muscles at the back and strengthen the deep neck muscles to improve your posture.
Keeping your eyes straight ahead, tuck your chin in
towards your chest (without looking down).
Repeat 10 times.