One of the stages of getting to know yourself is to know your own fear. Fear will control you if you turn a blind eye to it’s affects on your psyche and body so we will aim to bring our awareness to this as well.
One of the ways to learn the fear response is to learn how and when we bring our necks in. This happens as an innate response to a loud noise or unwelcome touch and is bodily explained by protecting the soft neck with the hard head and scull.
Most of the aggressive postures and movements can be traced to a fear reaction. All the hand movements are covering soft flesh with bone and bringing your chest and arms forward hides and covers your loins and abdomen where a stab will kill you sooner and delete the chances for future offspring.
On the other hand. A relaxed posture is neither closed nor open but mobility oriented as we are not stuck in the future or the past and free to roam the now moment.
Lie on your back with your arms at your sides and your legs together. Press from hip level to neck one side of the back to the ground so the lower back, ribs, shoulder blade and shoulder touch the ground together. Press the back of the neck to the ground and feel how this tension affects your thoughts. Repeat the pressing drill with the other side of the back and compare to know which of your sides is more tense at the moment.
Continue by moving your body from side to side as a worm to relax tightness and to ease instead of press the entire back to the ground. compare your neck tension levels to how it felt when you pressed it with force to the ground.
Slowly raise your legs off the ground and move you back again to better support the mass and change your arm position to relax more and more of your back to the ground.
Slowly relax your legs to the ground and use just breath and movement to ease all the parts of the back to the ground.
Now have a partner push and pull on you sitting and standing and note if your movement is more whole and less jumpy and tense than before.
The Martial Art of Walking 