That includes instructors too.
Yes. I am fortunate to have a coach who is foremost a Pilates trainer. For instance, last night's work session was about 45 minutes of dance and 30 minutes of warmup/cooldown aimed at developing good posture and body awareness. That is the balance I prefer – though I'd be willing to bet the world is full of hotheads who would complain about that not being 100% dancing, just as they complain about floorcraft training not being 100% dancing.
I put less weight on metatarsals and prefer a more straighter posture.
Weighting is negotiable. The important bit is that intention or "lean" doesn't come from thrusting out the chest or rear-end, or hinging at the hips – any of which will eventually wreck you – but from an upright posture slightly more forward than the one you might use on the street, with an unbroken line from top to bottom.
I might be putting 50% to 75% less weight compared to how I understand what you wrote above.
Maybe, maybe not. I'm not heavily forward on my metatarsals, either. My heel is still weighted. It's more a case of "enough weight over the metatarsals that I'm slightly forward of my street posture."
The right body mechanics technique is critical to maintain good healthy physique. That also means longer dancing life.
My coach calls it "sustainable dancing."
Because people too focused on technique are seen to lack musicality
That earns a triple eye-roll from me. It's precisely the opposite, of course. Technique enables musicality and enables you to push its limits, and musicality demands technique and forces you to push
its limits. It's an eternal game of leapfrog, each element one-upping the other until you die or quit dancing.
When somebody tells me, "Well, so-and-so has great technique, but their musicality is nothing compared to mine!", what I hear is, "I have cruddy technique, so I'm going to deflect your attention from that by claiming to have a gift you cannot easily see in a better dancer." Most of the self-proclaimed "musical" dancers are flappy arm-leader types who stomp on the notes as if they're walking on ground swarming with biting ants, and assume that you "see" rather than feel musicality.
It is hard to break a habit once formed. A person needs to actively work to break it.
It is probably difficult to break bad postural habits in dance through dance or dance instruction. I think that's a job for a physical trainer, physical therapist, or other somatic professional . . . though as my opening note implied, that might be the same person as a dance coach, and take place concurrently with a dance lesson.
There was a time long back it was common for instructors to teach and say lead with your chest and receive information with your chest. They didn’t talk about how the back or butt should be except in passing.
Instruction has generally improved, but the back still gets less attention than it should.
When I think about how I dance, I realize that
at the level of the torso, I transmit about 40% with my chest against my partner's, 40% with my back against their (closed-side) arm, 15% with my (closed-side) arm against their side and back, and maybe 5% with hand-to-hand compression on the open side. I do my best to use mainly the large surfaces of my body (chest and back), and to minimize arm implication. There is more to the picture: Of course I transmit globally with my displacements, occasionally with foot or leg contact, and even visually (especially in soltadas). I'd say that for me, global displacements and torso leads are close to 50/40 for me, with foot/leg and visual stuff picking up the last 8/2.
But . . . the back is a major part of the dance for me. People who implode
their back and don't read
my back are difficult to dance with indeed. So are people who can't respond to displacements as leads (the so-called "dynamic dance") and who take tiny, unresponsive, late steps, but that's another topic.
Or ask to bend forward from hips (as a hinge) but keep the back straight.
Ugh. I see lots of that here. It is far and away most popular among men of a certain age who decide to be self-taught "milongueros." And they all complain about their back.
People got this idea about lead with chest.
It isn't wrong – it might be 40% of the torso dance for me. But that's 40% of 40%, if you follow my math, and not everything or even most things.
Your technique (of posture) should be to avoid injury and pain.
Exactly! What's concerning is when people assume "no pain now means no injury ever." Lots of things are painless and will work for a few years, even a couple of decades. But as not one but three people I know discovered, rotate the wrong way while your back line isn't straight or you're hinging forward at the hips, and you'll be seeing a surgeon about your spinal column (probably T12/L1 or L5/S1).
Am a bit surprise. That use to be more common in 2000s and then gradually disappeared.
As you said, bad habits are hard to break. People who had those bad habits in 2000 probably still have them, if they haven't wrecked their back by now. And if they haven't wrecked their back by now, they're probably convinced they're fine, and maybe even infecting new dancers with their bad technique.
This!! People try to emulate without understanding how body mechanics work.
Again, I'm fortunate in my choice of coach. She literally hikes up pant legs to show me muscles and tendons, brings in anatomy textbooks to show why I should/shouldn't do specific things, and builds stretching and proprioception exercises into the dance class.