In the video, I see the guy just draw his neck a bit backward and make it align/perpendicular with his back. Is it what the term "Pack the/your neck" simply mean?
Edit: Added more context for guys who cannot see the video
In the video, I see the guy just draw his neck a bit backward and make it align/perpendicular with his back. Is it what the term "Pack the/your neck" simply mean?
Edit: Added more context for guys who cannot see the video
When you pack a suitcase, you often compress the items within it to get them to fit into a smaller space. In this case, I believe that "pack" means "shorten" or "compress" in this same sense, although of course you cannot really compress a neck in the same way that you compress clothes.