In order to know how to strengthen specific muscle groups, it is important to know the muscles origin, insertion, its isolated function and its integrated function. I hope you find the following information of help:
Origin: Posterior aspect of the sacrum; processes of the lumbar, thoracic, and cervical spine
Insertion: Spinous processes one to four segments above the origin
Isolated function: Concentrically accelerates spinal extension and contralateral rotation
Integrated function: Eccentrically decelerates spinal flexion and rotation; isometrically stabilizes the spine.
Hopefully the above information will assist you in determining appropriate exercises for your clients to “reduce, eliminate and prevent low back pain.”