12-minute hip flexor routine for lower back pain
When tight hips pull on your lumbar spine. Six stretches targeting the psoas-lumbar connection, with extra time on spinal decompression.
Important before starting:
Not all lower back pain is hip-flexor related. If your pain is sharp, radiating into a leg, or has followed a sudden injury, see a physiotherapist before attempting any stretching routine. This routine is for chronic, dull lower back ache associated with prolonged sitting or anterior pelvic tilt - not acute injury.
This routine starts gentle - lumbar decompression before any hip flexor loading
The psoas-lower back connection
The psoas major is unique among muscles: it is the only muscle that connects the spine to the leg. It originates from the transverse processes and bodies of the lumbar vertebrae (T12-L5) and inserts on the lesser trochanter of the femur. This means that when the psoas shortens, it pulls at two points simultaneously - on the upper femur (causing the hip to flex slightly) and on the lumbar vertebrae (causing them to be pulled forward, increasing lumbar lordosis).
In a healthy standing posture, the psoas is at a neutral resting length. After hours of sitting, it shortens adaptively. When you stand up, the shortened psoas keeps the lumbar spine pulled forward - the classic "anterior pelvic tilt" posture: pelvis tilted forward, lower back arched, buttocks pushed back. This position compresses the posterior elements of the lumbar spine (facet joints, intervertebral discs, posterior ligaments), producing the characteristic ache of desk-worker lower back pain.
The research evidence is strong: studies consistently find that hip flexor tightness (as measured by the Thomas test) correlates with lumbar lordosis angle and self-reported lower back pain in sedentary populations. Releasing the psoas - gradually, through sustained static stretching - reduces the lumbar pull and allows the spine to assume a more neutral position.
The six stretches
Always start here when lower back is involved. Lying on your back removes gravitational load from the lumbar spine. Drawing the knees toward the chest creates a gentle traction effect on the posterior lumbar facets - the very structures that are compressed by anterior pelvic tilt. Breathe slowly and deeply; each exhale releases a little more lower back tension.
The piriformis is the second most important muscle in the lower back picture after the psoas. It runs from the sacrum (the base of the spine) to the femur, and when tight it can create sacro-iliac (SI) joint pain and compress the sciatic nerve. The figure-4 is the definitive piriformis stretch, and doing it in the supine position means zero load on the lumbar spine.
Now that the lumbar spine has been decompressed, the kneeling hip flexor stretch directly targets the psoas at its lumbar attachment. The key for lower back sufferers: maintain an absolutely neutral lumbar spine during this stretch. Do not arch the back to increase the hip stretch - this loads exactly the structures you are trying to decompress.
Hip rotation restriction is often an overlooked contributor to lower back pain. When the hip cannot rotate freely, the lumbar spine compensates - rotating and side-bending when it should be stable. The 90/90 stretch restores both internal and external hip rotation, reducing the demand on the lumbar spine during everyday movement.
The deep external hip rotators - the piriformis, obturator internus and externus, gemellus superior and inferior - all attach to the sacrum or femur and influence pelvic position. Pigeon pose is the most complete external hip rotator stretch available. For lower back sufferers, the semi-prone position also allows the lumbar muscles to release passively.
End the same way you began - with lumbar decompression. After working through five stretches, this closing position allows the lumbar muscles to release any residual tension accumulated during the routine. Take your time. Let gravity do the work. If you fall asleep here, that is fine.
Stretching alone is not enough
The lower back pain and hip tightness cycle has two parts: tight hip flexors pulling the pelvis forward, and weak glutes failing to pull it back. Stretching the hip flexors is the first intervention, but if the glutes are not strong enough to oppose the psoas pull, the tightness returns quickly. Research by McGill (2002) and others consistently shows that combined hip flexor stretching plus glute activation produces more durable results than stretching alone.
After 2-3 weeks of daily stretching, add glute bridges and hip thrusts to your routine. This is the second phase of lower back recovery - strengthening the system that keeps the pelvis neutral, not just releasing the muscle pulling it out of position.
When to escalate to a physiotherapist
- Pain radiating into the buttock or down the leg (possible disc or nerve involvement)
- Lower back pain that worsens during or after this routine
- Pain that has not improved after 2-3 weeks of daily practice
- Any bladder or bowel changes (medical emergency - seek care immediately)
- Pain that is severe or woke you from sleep