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The psoas major is stretched with extension of the thigh at the hip joint; and opposite-side lateral flexion of the lumbar spine.
Note: Because the psoas major is the only hip flexor that crosses the spine, adding in opposite-side (contralateral) lateral flexion of the trunk at the lumbar spinal joints is extremely important toward preferentially stretching the psoas major among the other hip flexors.
The psoas major is stretched with extension of the thigh at the hip joint; and opposite-side lateral flexion of the lumbar spine.
