That's good advice. Swimming is great for this.
Here's a simple postural check/exercise from the Lama style. Stand erect with the shoulders relaxed. Let the arms hang naturally, then rotate the palms outward as far as you can. Try to pull the shoulders down at the same time. Then try to center your head above your torso by raising the back of your neck.
It's simple and you can do it several times a day without much effort. Keeps you in touch with the middle trapezius and other scapular stabilizers if your shoulder blades have moved out too far.
SPM, Lung Ying, Lion boxing and all of that family tend to "close" the front and "open" the back. Maybe try a few moves from styles that like to open the chest for side power for balanced development.
I used to know an old guy with more than fifty years of training in dragon style. His techniques were amazing but when he stood naturally his back was still hunched and his hands stayed in front of his hips. Reminded me of a velociraptor. Not that i've seen many of those--i'm not that old.
jd
"Look, I'm only doing me job. I have to show you how to defend yourself against fresh fruit."
For it breeds great perfection, if the practise be harder then the use. Sir Francis Bacon
the world has a surplus of self centered sh1twh0res, so anyone who extends compassion to a stranger with sincerity is alright in my book. also people who fondle road kill. those guys is ok too. GunnedDownAtrocity