Answer:
Rectus abdominis and hamstrings
Explanation:
The rectus abdominis has the ability to produce thoracolumbar flexion, pelvic retroversion, lateral tilt or flexion movements of the spine, and depression of the rib cage to assist in forced expiration. It is a very important muscle for lumbar movement and should be the focus in treating a client who has a posterior pelvic tilt and a diminished anterior curvature of the lower back.
The rectus abdominis also by virtue of its fixation point has the ability to produce the pelvic retroversion movement. For this he (rectus abdominis) will act synergistically with the gluteus muscles and hamstrings which are also important for the treatment of posterior pelvic tilt and a diminished anterior curvature of the lumbar region.
