Nodding the chin down instead of drawing it back
The movement is horizontal retraction not flexion; looking down is incorrect.
Overactive muscles
SCMSuboccipitals
Corrective work
Foam RollSuboccipitals (lacrosse ball)↗StretchSCM / scalene stretch↗The movement is horizontal retraction not flexion; looking down is incorrect.
Many people are so tight that the retraction is minimal; practice daily.