The back extension machine targets the erector spinae, which are three muscles: illiocostalis lumborum, longissimus thoracis, and the spinalis . This bundle of muscles lies in a groove along the vertebral column. These muscles extend your lumbar spine.
What are back extension muscles?
The back extension machine targets the erector spinae, which are three muscles: illiocostalis lumborum, longissimus thoracis, and the spinalis . This bundle of muscles lies in a groove along the vertebral column. These muscles extend your lumbar spine.