Do you have a headache? Have a pulled muscle? Here is an exercise we could call virtual aspirin. Through it you can dissolve pain and get to know the polarity of tension and its pain-free opposite:
Take an hour or so and lie down on your back. Close your eyes and let your mind travel through your body searching for a muscle group that is under tension. A particular muscle group probably comes to mind. Allow your mind to center the muscles and just listen quietly for a moment. Sense the tension in the muscles. Imagine there are two hands hovering above the tense muscles. Imagine that there are warm pulses coming from the hands and that the tension is leaving your body and going up into the warm hands. Then relax the muscles under the two hands. You may feel that the tension leaves temporarily but then returns. That is fine. Just repeat the exercise by replacing the tension with warmth and the sense that the muscles are dissolving in fluid. It may take two or three passes of the warm spiritual hands to allow the muscle to really dissolve.
Usually when it does, a big yawn or stretch, often accompanied with tears from your eyes, will let you know that a transition has happened that dissolves pain.
Contemplate pain and not-pain and see how they feel to you. Sense the forces in the tension. The tension is actually our sense of strength. We need it to get through the day. But we also need to balance it with the dissolving forces in order to nourish and heal the effects of the tension.