Which of the following lists muscle groups that are commonly considered postural muscles?

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Postural muscles keep the body upright against gravity, especially stabilizing the head, neck, and spine. The neck flexors and extensors along with the spinal extensors and flexors are built for sustained, low-force activity to maintain alignment and resist sagging. They’re typically endurance-oriented, with more slow-twitch fibers, enabling long-lasting stabilization. The hamstrings and quadriceps are primarily movers at the hip and knee, not dedicated stabilizers of the spine and neck. The gastrocnemius and soleus mainly plantarflex the ankle and contribute to locomotion rather than spinal postural control. So the neck and spinal muscle groups are the ones that fit the role of postural muscles.