What muscle group includes the erector spinae?

The erector spinae is indeed categorized as a muscle group that acts as spinal extensors. This group of muscles runs along the spine and primarily functions to extend and stabilize the vertebral column, aiding in maintaining an upright posture and allowing for various movements such as bending backward. The erector spinae is crucial for spinal health and plays a significant role in core stability during physical activities.

The other options relate to different muscle groups that serve distinct functions. Anterior neck muscles are involved in movements such as flexing the neck. Shoulder stabilizers support shoulder movement and stability during arm activities. Chest muscles, primarily responsible for movements of the upper arm and shoulder, do not include the erector spinae. Thus, identifying the erector spinae as spinal extensors highlights its role in supporting the spine and facilitating its movement.