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Contraction of these deep core muscles provides segmental stabilisation of the spine. The outer unit consists of many muscles such as the Obliquus externus, Obliquus internus, Erector spinae, Latissimus dorsi, Gluteus muscles, the Quadratus lumborum, adductors and hamstrings.
To the rehabilitation world the core is the lumbar-pelvic (trunk) and hip complex. The Core is composed of as many as 35 different muscle groups connecting into the pelvis from the spine and hip area.In order to simplify the Core muscles I have divided them into four regions; back extensors, abdominals, lateral trunk muscles, and the hip muscles. have put together an evaluation of specific tests to determine muscle strength of the core muscles. One of the tests I use is a simple single leg stance position. It is amazing how many athletes have difficulty standing on one leg for 6 seconds.