The lumbar spine extensors are an important part of your core muscles, playing a key role in stabilizing the low back. The function of the lumbar extensors is to extend, or arch, the lower spine. These muscles also resist excessive forward movement of the back bones when the spine is bent forward.

Lumbar extension exercises improve range of motion, increase lower back strength, and help relieve pain and stiffness in people with arthritis in the lumbar spine. What muscles are involved in lumbar extension? Lumbar extensions work the lumbar extensors, a group of muscles that include the erector spinae and multifidus.

The extensor muscles are attached to back of the spine and enable actions like standing and lifting objects. These muscles include the large paired muscles in the lower back, called erector spinae, which help hold up the spine and the gluteal muscles.

Extensor muscles. Attached to the back of the spine, these muscles allow us to stand and lift objects. They include the large muscles in the lower back (erector spinae), which help hold up the spine, and gluteal muscles.