Stretch library
Psoas Stretch
The psoas sits deeper than the hip flexors most stretches reach. The pelvic tilt, rib position and glute cue that make the difference, plus what tightness means.
How to do it
- 01Half-kneel with your right knee down and left foot flat in front, both knees at roughly 90 degrees.
- 02Tuck your tailbone under to posteriorly tilt the pelvis, and hold that tilt for the entire stretch.
- 03Draw your bottom ribs down toward your hips. The psoas attaches to the lumbar vertebrae, so a flared ribcage lets your back extend and unloads it.
- 04Squeeze the right glute hard. Most people feel the stretch appear at this moment without moving at all.
- 05Only if you still need more, shift your weight forward a few centimetres. Hold 60 seconds and switch.
The psoas is the deepest hip flexor. It starts on the sides of the lumbar vertebrae, runs through the pelvis, and attaches to the inside of the femur — the only muscle connecting your spine directly to your leg.
That attachment is why a general hip flexor stretch usually misses it, and why the correction is not “stretch harder”.
Why most attempts stretch the quad instead
The muscle most people actually lengthen in a lunge stretch is rectus femoris — the hip flexor that is also a quadriceps. It is superficial, it crosses the knee, and it gives up range easily. So it takes the stretch, you feel something in the front of the thigh, and the psoas underneath never changes length.
Two things fix that.
First, the pelvic tilt. Tuck the tailbone under and hold it. Without this your pelvis rotates forward as you lean, which slackens the psoas at exactly the moment you think you are stretching it.
Second, the ribs. Because the psoas attaches to the lumbar spine, an extended lower back and a flared ribcage shorten it from the top end. Draw the bottom ribs down toward the hips and hold that too.
Do both, squeeze the rear glute, and most people feel the stretch arrive before they have moved forward at all. That sensation — deep, in the crease of the hip rather than the front of the thigh — is the psoas.
Tight, or just working hard
The psoas is heavily involved in stabilising the lumbar spine, and a muscle doing stabilising work it was not asked to do feels tight regardless of its length.
If your anterior core is not controlling the position of your pelvis and ribcage, the psoas often picks up the slack. Stretching it in that scenario gives you an hour of relief and then it tightens again, because you removed the sensation without removing the job.
The pattern to watch for: you stretch it daily, it feels better immediately, and it is back tomorrow. That is a muscle being recruited to do something else, and the answer is anterior core control — dead bugs and similar — rather than more stretching.
Where this sits among the hip flexor stretches
Three pages on this site cover overlapping ground, and the distinction is worth stating. The general hip flexor stretch page covers the variations and ranks them. The kneeling version covers the setup details of the specific position most people use. This page is about the deepest of those muscles and the two cues — tilt and ribs — that determine whether you reach it.
Common questions
What is the best psoas stretch?
A half-kneeling lunge with a deliberate posterior pelvic tilt, ribs drawn down and the rear glute squeezed. The tilt and the rib position are what separate a psoas stretch from a quadriceps stretch — without them you lengthen rectus femoris and extend your lumbar spine instead.
How do I know if my psoas is tight?
The Thomas test is the standard screen: lie at the edge of a table, hug one knee to your chest, and let the other leg hang. If the hanging thigh sits above horizontal, hip flexor length is limited. It does not tell you whether the psoas or the rectus femoris is responsible — bending the hanging knee changes which one is loaded.
How long should I hold a psoas stretch?
Sixty seconds per side, two to three rounds, most days. The psoas is a deep postural muscle that responds slowly, and short holds rarely change anything lasting.
Can a tight psoas cause lower back pain?
It is plausible and frequently claimed, though the evidence is more mixed than the internet suggests. The psoas attaches directly to the lumbar vertebrae, so sustained shortening can increase the lumbar arch. It is one possible contributor, not the default explanation for back pain.
Why do I feel psoas stretches in my quad instead?
Because you have lost the pelvic tilt. Without it, the lunge lengthens the rectus femoris, which crosses both the hip and the knee, and the deeper psoas stays slack. Re-tuck the tailbone and squeeze the glute before shifting forward at all.