AFAA Personal Trainer Certification Practice Exam

Which muscle group opposes the erector spinae?

1. Hip abductors

2. Abdominals

3. Hip adductors

4. Deltoids

The correct answer is: Abdominals

The muscle group that opposes the erector spinae is the abdominals. The erector spinae is a group of muscles that run along the spine and are primarily responsible for extending the back and maintaining an upright posture. These muscles help in actions such as straightening the spine from a flexed position and controlling movements related to trunk extension. The abdominals play a crucial role in stabilizing the spine and providing balance during movements. They work by flexing the spine and resisting extension. This opposing action is essential for maintaining proper posture and spinal alignment, especially during activities that require bending, twisting, or lifting. In the context of exercise and functional movement, the interplay between the erector spinae and the abdominals is vital for effective core stability. When one group is activated, the other is often recruited to stabilize and support movement, thus highlighting the significance of both muscle groups in overall back health and functional capacity.