Collocations for posture - noun

correct, good, perfect (esp. AmE), proper
bad, poor
erect, upright
the normal upright posture

stiff
body
yoga

have
She has very good posture.

adopt, take, take up
maintain
change, improve
straighten (esp. AmE)

in a/the posture
He sat in a posture of absolute respect.

posture for
a poor posture for driving

defensive
aggressive, threatening
military

adopt, assume, take, take up
maintain
regain (esp. AmE)
Michael gulped as he struggled to regain his posture.

posture towards/toward
to adopt a threatening posture towards/toward an opponent