Start in a seated or standing position with your arms hanging by your side.
Drop your head toward the right, your right ear moving towards your right shoulder.
With your right hand hold onto the left side of your head just above your left ear and gently pull your head in the direction it was already moving, this will increase the stretch.
You can add to the stretch by pressing your left shoulder downwards.
Return to the starting position before repeating on your left-hand side.