The gluteus muscles, glute maximus deep, glute medius, and glute minimus, act on the pelvis, hip, and knee.  They maintain the position of the pelvis, especially when standing on one foot, and play an important role as stabilizers of the hip and knee joints during standing and walking.

The abdominals muscles, transversus abdominis, internal and external oblique, and rectus abdominis, have no attachments to the spine, but move the spine.  They sideband or ipsilaterally rotate the spine and ribcage, compress the abdomen and flex the trunk.

The muscles of the lower abdomen, obturator internus, levator ani, and coccygeus, comprise the muscles of the pelvic floor, supporting the weight of the pelvic organs.

Training these muscles in all ranges and with respect to the direction of the different muscle fibers is essential.