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n. A compound muscle composed of the iliac and psoas muscles

n. The great flexor muscle of the hip joint, divisible into two parts, the iliac and great psoas, -- often regarded as distinct muscles.

n. The iliacus and psoas magnus muscles taken together, or some muscle which represents them.

"It's a magic pose that targets many stretches at once: it unlocks tight hips, IT band, hamstrings, iliopsoas, quads, releases sciatica and lower back tension."