Body scanning is a meditative technique that lets the mind wander, searching the body, looking for areas that are holding tension. If you regularly scan your body, over time, it can reveal patterns in where, and how, you hold onto stress.
Our body is typically reacting to stress long before we're consciously aware of it. As we become more adept at observing ourselves, we cultivate our ability to identify the early signs of stress. Regular meditation increases our awareness of both physical sensations, and the ways that our mind and body interact.