Back when I lifted and hadn't yet heard of Mewing, deadlifts used to make my tongue and neck sore, but it was not enough to encourage proper tongue posture. In retrospect, I view weightlifting as a very inferior way to improve posture, and I think it would be better to learn to generate force & tension in balanced and engaged manner throughout the body before doing any kind of serious lifting.

The act of lifting a heavy weight pressures the anatomy to default back to the most habitual patterns of movement in an attempt to maximize stability and minimize risk of injury. This has one significant problem: if you are habitualized to asymmetrical movements, you will end up strengthening the existing asymmetry. Whatever asymmetry you perform a movement with will be remembered by the nervous system. And they are cumulative. The asymmetries with which you bench press 100 kg will be there when you bench press 150 kg, plus some more.

The only way to lift to strengthen symmetry is to never increase load until you can lift the previous load perfectly all the way through the full range of motion. For 90% of gymrats, this means reverting back to body-weight exercises.

I've always focused on symmetry, and have improved my bench symmetry a lot. I still need to fix my shoulder/deltoid asymmetry. Clavicles are equal in length, but the deltoids look significantly different. My legs are also the same height, but my squat is slightly asymmetrical. I wouldn't consider myself a gym rat per se, as I've been a cross country runner and track/field athlete my whole life, but went into lifting and instantly started following a program, and read about proper form, whereas most people just go in lift what feels right to them, and lift with the absolute worst form. I've of course seen people with very good form also, but those are fewer and farther between. I don't body build though, I want to increase athletic ability and gain good weight. Next workout, which is in roughly an hour, I'll pay very close attention to symmetry in all lifts, and lower the weight as to not tire my body and start slacking on good posture.

A Correct workout form is essential. It's effectively in relation to the "structure-form-function" relationship that Dr Mew articulates in not only his tongue posture videos, but much of the neck posture and vertebrae alignment videos. As far as his explanations go,  the neck position that you must adopt (chin tucked in to attempt to push the neck/cervical vertebrae in line with the spine) is a precursor to the tongue posture 'excercises' - it enhances the effectiveness (or form) of your tongue on palatal roof action. So we have a classic example of structure (neck/spine), form (tongue and neck), function (increased airway, improved arch and dental line up). And ultimately, better form almost always leads to much more impressive aesthetics!

Google Dr Mews McKenzie chin tuck video. It is solely focused on strengthening the neck muscle to keep the neck/cervical curve aligned with the spine - he recommends 3-4 sets * 20 reps for noticeable 'gains'. I incorporate it with squats (air) as part of my HIIT circuit (note my workout type is predominantly body-weight using resistance bands and pull bar). 

Actions that could contribute to spinal reflex should definitely be avoided as they bring rise to the protruded neck problems that one is working to rectify whilst observing correct tongue posture e.g. if you're big on crunches but execute partial/poor form then avoid it - stick to an Ab Roller for instance.

 

**Not sure why my above post has formatted like that?  To improve readability I've rehashed the whole paragraph out below**

A Correct workout form is essential. It's effectively in relation to the "structure-form-function" relationship that Dr Mew articulates in not only his tongue posture videos, but much of the neck posture and vertebrae alignment videos. As far as his explanations go,  the neck position that you must adopt (chin tucked in to attempt to push the neck/cervical vertebrae in line with the spine) is a precursor to the tongue posture 'excercises' - it enhances the effectiveness (or form) of your tongue on palatal roof action. So we have a classic example of structure (neck/spine), form (tongue and neck), function (increased airway, improved arch and dental line up). And ultimately, better form almost always leads to much more impressive aesthetics!

Google Dr Mews McKenzie chin tuck video. It is solely focused on strengthening the neck muscle to keep the neck/cervical curve aligned with the spine - he recommends 3-4 sets * 20 reps for noticeable 'gains'. I incorporate it with squats (air) as part of my HIIT circuit (note my workout type is predominantly body-weight using resistance bands and pull-up bar).

Actions that could contribute to spinal reflex should definitely be avoided as they bring rise to the protruded neck problems that one is working to rectify whilst observing correct tongue posture e.g. if you're big on crunches but execute partial/poor form then avoid it - stick to an Ab Roller for instance.