"Postural muscles" refer to the muscles in our body that help us maintain a stable and upright posture, such as sitting or standing straight. They provide support and help us stay balanced. Full definition
The position itself forces you to use important postural muscles in a safer environment closer to the ground. (onnit.com)
After keeping a consistent daily workout routine, you will notice improved body balance and good control of postural muscles extending from the ground up through your scapula and shoulder girdle. (hab-it.com)
But practicing Sukhasana regularly can release the hips and groins, strengthen core postural muscles, and even soothe frantic nerves. (yogajournal.com)