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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.](https://learnmuscles.com/wp-content/uploads/2017/10/Psoas-major-stretch-low-res-1-436x1024.jpg)
The psoas major is stretched with extension of the thigh at the hip joint; and opposite-side lateral flexion of the lumbar spine.