Louis,
I have to agree with you about these strictures being "negative prescriptions". It's more of a counter for bad habits than anything else.
I found it humorous that you used almost the exact same wording as Sifu uses to describe what westerners think of as "standing up straight". He used to tell us that this kind of military posture was the worst possible way to stand.
"Tucking in the chin" counters the bad habit of sticking out the chin, "tucking in the hips", counters the ramrod straight back that military style "attention" standing brings.
Now, "tucking in the chin" can demonstrably raise the headtop and straighten the neck and upper back. I do know this for a fact as my PT measured the results three times a week for three months on me. I started with very little flexion (his word that I don't know if I'm spelling correctly) due to my injury but was very quickly able to flex further than he thought possible. Doing this hurt like crazy for the first few weeks, though he said it was more because I was opening the nerve pathways by doing so and allowing a surge of feeling to move into areas that had been numb than because I was doing any damage. I had to learn to ignore the "phantom pain" (another of his expressions that I have no idea if it has any clinical basis) and keep flexing and stretching the muscles and bones in my neck until I had opened it up again. "Tucking in the chin" was only one of many excercises I had to go through to reach this goal. I still do all these exercises, three times a day, usually as part of my warm up before TCC practice.
I spent a great deal of time in cervical traction as well. This was fascinating to me, as it pulled my neck up and quite literally suspended my headtop. When I had that collar on and all that weight pulling my neck back where it was supposed to be I felt like a did when I was eighteen again, or more like I did when I was in full time training at WTCCA and as loose, "song", as I could get.
When in traction, I was able to "tuck in" my chin and enhance this feeling even more. Out of traction I got into the habit, again, of keeping my chin "tucked", my headtop raised and my neck empty of tension. Out of traction it works very well on it's own.
"Tucking in the chin" is the single fastest and easiest way to attain the desired straightening and elongating of the neck that I have found.
When I simply supsend my heatop and empty my neck, I feel loose and relaxed, but I do not get the same open and extended feel I get when I "tuck in".
I have heard the expression "the neck should touch the collar of your shirt". I, like you, find that to be a bit too vague. Which shirt? How much of my neck should be touching the collar?
I read an article once, purportedly from a student of a disciple of Yang Zhenji though I do not recall his name. He claimed that he would occasionally have classes with Master Yang Zhenji and that the Master would often exclaim "show me your neck!". I had no way to verify the veracity of this claim and do not have the article on hand to give any more detail. I only recall it because of the "show me your necks!" quote. I was just starting YCF style TCC training at the time and I was reading every article I could find on the style. I knew YZJ was YZD's older brother, and I was caught by the "necks" reference, as that was a big problem for me back then.
If I'm remembering clearly, the author went on the explain that YZJ expounded on "lifting the headtop, emptying the neck" and that this would have the effect of "showing your neck" from above a collarless shirt. That if he couldn't see your neck you were doing it wrong.
Again, I was yelling at the article (a bad habit of mine) "Where's the "tuck in" advice! Why not continue it and tell them "tuck in your chin" so they can get all the way there?". Alas, it was not to be found in the article.
It seems simple, almost elementary, to me that "tucking" raises the heatop and empties the neck, all by itself, if you do it in the correct fashion. No guesswork about what "emptying the neck" means. No guesswork about what "raising the headtop" means. It all just happens naturally if you "tuck in your chin" as I've described.
Again, photos of Masters from the two families put them in the same position, so it's a battle of semantics, I believe. I just find it easier to get into the proper position with the mental image of "tucking" rather than a complicated, question frought formula of "raising and emptying".
But that may just be me as I've seen practitioners from both styles reach the same posturing in their own way.
Good thread, Louis.
I have thought of starting a similar thread for a long time. It's obviously a subject on which I am conversant.
Unfortunately so.

