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Proper Back Extension Form. This muscle is located in the deep areas of the spine and involves the iliac crest, the lumbar vertebrae, and.
This muscle is located in the deep areas of the spine and involves the iliac crest, the lumbar vertebrae, and.
This muscle is located in the deep areas of the spine and involves the iliac crest, the lumbar vertebrae, and. This muscle is located in the deep areas of the spine and involves the iliac crest, the lumbar vertebrae, and.
