The transversus abdominus is the deepest of the abdominal muscles. Its fibers run horizontally, originating from the iliac crest, the inguinal ligament and the thoracolumbar fascia and inserting on the lower costal cartilages. Contracting the transversus abdominus compresses the abdomen and tones the abdominal organs. This muscle is important for udyana bandha and nali. Awaken and strengthen it in navasana.
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