In any case, still body is just a means to still mind, yeah?

?
Pranayama is not about getting a silent mind or stilling the body.
Correct me if I am wrong.
Meditation = coretechnique = stilling body and mind.
Breathing technique is just half of pranayama, the other half is a mind that can give
the lead to pranaflow through the channels.
Though breathing can have the result of calming the nervous sytem,
pranyama is about manipulation of the spinal nerve
and flow of lifeforce:
Advanced Yoga Practices:
"During pranayama, when we consciously slow
down the breath and mentally take it along a particular pathway, we
influence the flow of prana in that pathway. It is a kind of
induction. It is like inducing an electrical current in a wire with a
magnet. So, using the breath in coordination with the mind, we are
able to engage in selective purification of a particular channel in
our nervous system "
"This channel is the tiny thread-like nerve that runs
up inside the spine and through the brain. It is called
the "sushumna." Purifying and opening this nerve is where pranayama
and additional advanced yoga practices will be focused. "