This offers the opportunity to feel areas of increased or decreased muscle tension, as well as search for heat and swelling. Long, firm, gentle strokes along the large muscle groups serve to calm the horse and reassure him about being touched. Maintain your dialogue with him and ask him where he is uncomfortable. Observe whether your attention is directed to a specific body part. By using your hands for grooming, rather than a brush, you will have the advantage of closer contact and better tactile sense of the symptoms of injury.
P is for perceive.
Perhaps it is also for palpation. To palpate is to explore the structures beneath the skin with care. While you are doing this, make your focus clear. This is quality time for you and your horse, one on one. It is not a time to deal with your own issues.