For Rachel Klingberg of the Pony Express 🙂
Here is a specific drill to learn to move to survive with head hits. Start standing and have your partner push various parts of your head and neck. At first just allow your body to move as a whole with the direction of the contact while you keep breathing and remain aligned letting the movement balance the contact. Next have your partner hold you with one hand and hit you in the same places with his other hand and you still move with the body aligned using the same principle of moving with the contact direction or directions and remembering to breathe and to move just as you have to. Continue to using a stick to push the head and neck and responding in the same way to this rougher medium.
Now that you know your body can move with the contact even when held (you can also do this against the wall) allow the neck to move with the contact so instead of moving your neck in place you move your body and your neck moves with your body so the twist or crank we feel when we receive hits and freeze a part of us is cleaned out.
Please note to allow the neck to move rather than react out of fear so you let the impact glance rather than sink and when this is done you can act and direct and control after you have control over yourself.