Sit or stand up straight.
Ensure your posture is upright with your weight equally spread.
From a neutral position with your head, pull your head backwards so that your chin tucks in.
Feel the back of your neck lengthen.
Keeping this position, tilt your head backwards to look up towards the ceiling.
Ensure you continue with your chin tuck.
Do not allow your shoulders to hunch up.
Turn your head gently one way and then the other.
Ensure you continue to attempt to move your head further back.
Bring your head to the middle before returning back up to the starting position.