How are we to relate to physical sensations during meditation?
Pleasant and unpleasant physical sensations that arise during meditation are impermanent. When you attach to or desire that which is impermanent then suffering will be experienced. Therefore, do not cling or identify with any sensations.
When the intensity of unpleasant sensations during meditation is so severe that they affect the peacefulness and calm of the mind then it is appropriate to move the body with mindfulness in order to lessen the intensity. If the intensity is not severe then it is best to train the mind to tolerate them in order to build up tolerance. Try to stay with intense unpleasant physical sensations a little longer every time you sit in meditation before adjusting the body.
The physical body and sensations arising in the body, whether they be gross or subtle are contents of experience and not pure consciousness.