So when we say think about your neck being free, it isn’t a matter of trying to feel whether it’s free and then trying from there to free it. You don’t have to try to free it. Trying to free it implies making some sort of effort to free it, and freedom is not going to be brought about by effort; stiffening is brought about by effort. If your neck is stiff, it’s because you’re stiffening it. If you stop stiffening it, then it will be free. So it isn’t a matter of trying.
Walter Carrington (“Thinking Aloud” – Directing the Neck and Head p60)