We start with at least three students for this drill. One stands and accepts the contact working to move as a whole and keep his sight relaxed. The second walks about and works both to be relaxed and not show his intentions and to come in and take down either other student when his attention is narrower and the third standing or walking around the first and applies this treatment to help him accept contact and avoid injury.
You gently place your fist on his head and neck and from the shoulder and elbow release tension to sink in where the awareness in the contact is lower and affect his entire body and psyche. Use burst breathing for this (swift exhale and relaxed inhale) and once the sink is over remove the contact swiftly starting the movement from the shoulder. This reverse engineering of getting strikes will enable with diligent practice to release the excess brace tension when struck and what remains is whole natural movement and eyes that see all instead a narrow tunnel along the fist coming your way.
Giving classes is a privilege and a joy to me and it is also a chance to thank my students for showing up and giving their hearts and minds to the work.
The Martial Art of Walking 