some positions improve breathing.
Just like standing meditation does.
Well you need someone to correct your postures if you do the standing meditation.
And you need persistence, and so on to have an effect finally.
BUT BUT BUT
But the thing is :
why is it that the posture is not ok in the first place?
Our attitudes (mental/emotional) have a big influence on our posture in the end.
With simple vipassana meditation,
without any movement at all,
I noticed a HUGE change in natural body posture, flexibility, breathing and so on.
What are the ingredients?
the moral rules
the sitting
the developing of equanimity !!!!
the concentration,
and so on.
Just leave out some factors and see what it does to the effect.
Why is Vipassana not good for everybody at a given moment?
Therefore you need to know the theory of elements very well.
Some taoists really understood this.
Understanding is not about mental understanding.
It's about the experience.
If you want to understand deeply,
you will need to meditate a lot,
and to be alert (in a relaxed way) on what certain circumstances/ thoughts / emotions do to your body, with patience.
After a while you won't have that much questions anymore,
and you will know that you certainly don't need an answer from fake scientists,
because a lot of them are stil asleep (while highly overpaid like their peer politiciancs).
I hope it's clear,
if it's not just open your eyes,
because it's SIMPLY reality.