The last step in modifying this stretch is to lean your head toward the shoulder that causes the most additional pulling. Usually, if the pain is on your right side, you'll need to lean your head toward your left shoulder, and if the pain is on the left, you'll need to lean toward the right shoulder. This will produce additional pulling and stretching of the offending muscles. At this point, you should feel some very strong pulling from the side of your neck into the same side of your upper back and possibly to the shoulder blade. You have now combined flexion, rotation, and lateral bending to isolate the problematic muscle tightness.
Hold the stretch for ten to twenty seconds, and then very gently, carefully, gradually, tenderly, and cautiously move your head and neck back to the neutral position (an erect and upright posture looking straight ahead.) The first time you do this, you are going to feel a significant amount of strain and pulling in the muscle, so don't force it. As you repeat this stretch seven to ten times, each repetition should bring some additional movement, relaxation, and stretching of the area. Never use your hands or any other devices to try to force or enhance the stretch. These are relatively fine muscles, and if you try to externally force the stretch, you run the risk of causing additional muscle strains and sprains.
Find out more about this book:Your Miraculous Back: A Step-By-Step Guide to Relieving Neck & Back Pain