>>143833
>what else? I really struggle with the oral posture, can't hold it for 5 seconds. last week or so I can't get it at all
Make sure you have given release to the temporomandibular joints. The jaw should rest approximately as Mew describes without conscious effort. Just as a spine should stand erect on its own if seated or standing correctly, the jaw has an ideal place it will automatically align itself with when the joints breath freely. When one has poor ability to keep the spine upright, the fix is not to constantly, willfully tense the spinal column into a certain position. The discs balance themselves when the foundation is positioned neutrally and joints are not cramped and frozen. Sometimes there is a weakness or a laxity in the surrounding tendons and muscles that promotes quick loss of alignment. Of course you want to strengthen those tissues as Mew advises for the jaw, but creating mostly tension in those muscles before release of the joint capsule can sometimes reinforce a dysfunctional position. If you had a crooked spine and you were able to get a chiropractor to fix it, would you start deadlifts before or after the realignment?
It's good to exercise the jaw. It can warm up the joint so it can break free, but you have be careful that you aren't freezing it into position with excess tension. Stretch while tensing gently to put some life into the whiter, less oxygenated tissues. You may need wiggle the jaw around and play with it until you accidentally find that magic spot that makes the whole thing pop. Careful about your eardrums though. You might tug on them a bit while stretching.
https://en.wikipedia.org/wiki/Temporomandibular_joint
https://en.wikipedia.org/wiki/Capsule_of_temporomandibular_joint