The piriformis is a small muscle deep in your glute that most people never think about until it starts aching — and then it's suddenly all they think about. Here's the honest guide. The piriformis is a deep rotator muscle in your glute, it gets tight from prolonged sitting and hip weakness, and the figure-four stretch is the most effective and accessible way to loosen it. Here's how to do it properly.
Note: deep glute or buttock pain can have several causes, some involving nerves. If your pain is persistent, severe, or comes with numbness, tingling, or weakness travelling down your leg, see a doctor or physiotherapist rather than stretching through it.
What the piriformis actually does (the honest mechanics)
The piriformis is a small, flat muscle running from your sacrum (the base of your spine) to the top of your thigh bone, sitting deep beneath your glute max. Its jobs are externally rotating your hip (turning your knee outward) and helping stabilise the pelvis when you walk or stand on one leg. It matters more than its size suggests for two reasons: it's part of the deep hip rotator group that keeps your hips controlled, and it sits in close proximity to the sciatic nerve — which is why tightness in this area sometimes produces symptoms people describe as sciatica-like. That proximity is also why guessing about deep glute pain is unwise.
Why it gets tight (the honest causes)
The usual contributors are unglamorous and familiar. Prolonged sitting is the big one — sitting compresses the area and keeps the hip in a fixed position for hours. Weak glutes (particularly glute max and medius) force the smaller deep rotators like the piriformis to work harder than they should, and overworked muscles tighten. Sudden increases in running or activity load it quickly. And sitting on a wallet in a back pocket is a genuinely common irritant worth mentioning because the fix costs nothing. Address the sitting and the glute weakness and you've handled most of the cause rather than just chasing the symptom.
The best piriformis stretch (figure-four)
The figure-four stretch is the most reliable option. Lying version: lie on your back with both knees bent, cross one ankle over the opposite knee (making a figure four), then reach through and pull the supporting thigh toward your chest until you feel a stretch deep in the crossed leg's glute. Hold 20–30 seconds, breathe, and switch sides. Seated version: sit in a chair, cross one ankle over the opposite knee, keep your back straight, and lean forward from the hips — ideal at a desk, which is where the tightness came from. The cues: feel it deep in the glute, not the knee or lower back; keep your back straight; never force it.
Other useful options (variety)
A few alternatives if the figure-four doesn't reach it. The supine spinal twist — lying on your back, drop both knees to one side while keeping your shoulders down — gets the glute and lower back together. Pigeon pose (from yoga) provides a deeper stretch, though it's demanding on the knee for some people, so back off if you feel it there. Standing figure-four — crossing an ankle over the opposite knee and sitting back into a mini squat, holding something for balance — is convenient anywhere. And foam rolling or a lacrosse ball on the glute can help some people, though go gently near the deep glute given what runs through there.
The force-it-and-knee-pain sin (two cautions)
Two honest cautions with this one. First, don't force the stretch or crank into it aggressively — deep glute tissue near a major nerve is not somewhere to be forceful; ease into mild tension and hold steady. Second, if you feel it in your knee rather than your glute, back off — this is common in the figure-four and pigeon positions, and it means the knee is taking the strain instead of the hip. Reduce the depth, adjust the angle, or use the lying version where you control the load precisely. And if a stretch reproduces shooting pain or tingling down your leg, stop and get it assessed — that's a signal, not something to stretch through.
Strength is half the answer (pair accordingly)
Here's the part pure stretching advice skips: if your piriformis is tight because your bigger glutes are weak, stretching alone treats the symptom and the tightness keeps coming back. Strengthening the glutes takes the load off the deep rotators. Use glute bridges and hip thrusts for glute max, plus lateral band walks and hip abduction work for glute medius. Add hip flexor stretching, since sitting tightens the front of the hip too, and general single-leg work like the Bulgarian split squat. Stretch daily, strengthen twice a week, and move more often than you sit still.
Quick answers
What is the piriformis?
A small deep muscle in your glute that externally rotates the hip and helps stabilise the pelvis.
What's the best piriformis stretch?
The figure-four stretch — lying or seated — crossing one ankle over the opposite knee and drawing the leg toward you.
Why is my piriformis tight?
Usually prolonged sitting, weak glutes overloading it, or a sudden increase in activity.
How long should I hold it?
20–30 seconds per side, repeated a couple of times, ideally daily.
Where should I feel it?
Deep in the glute of the crossed leg — not in your knee or lower back.
Will stretching fix it permanently?
Not on its own — strengthening your glutes addresses the underlying cause.
When should I see a professional?
If you have persistent or severe pain, or numbness, tingling, or weakness travelling down your leg.
A tight piriformis is usually a small muscle doing a big muscle's job. Stretch it for relief — strengthen your glutes so it stops happening.
The piriformis tightens from sitting and from covering for weak glutes, and the figure-four stretch is the most effective way to release it. Hold gently for 20–30 seconds a side, feel it in the glute rather than the knee, and never force it. Then do the part that actually lasts: strengthen your glutes so the little muscle stops carrying the load.