Ankle On The Knee
The supine figure-four: cross one ankle over the opposite knee, then pull the bottom thigh toward your chest. Combining hip flexion with external rotation is what loads the deep rotators and the back of the glute, and doing it lying down means the floor supports your spine while you do it.
Own the movement
Set up first, then execute. Every cue below is something you can check on your next set.
Before the first rep
- Lie flat on your back with both knees bent and both feet on the floor.
- Cross one ankle over the opposite thigh, just above the knee, so the shin sits across it.
- Flex the crossed foot — pull the toes toward your shin — to protect that knee from twisting.
- Thread one hand between your legs and clasp the other behind the bottom thigh or knee.
- Let your head, shoulders and lower back stay in contact with the floor before you pull anything.
Every rep
Breathing & tempo — Slow nasal breathing, four seconds in and six out. Draw the thigh a fraction closer on each exhale; hold your ground on the inhale rather than releasing.
How much, how often
Where to start, and what to change when it stops being hard.
No load. Two holds of 20-30 seconds per side, done most days, gives more range than one long weekly session. Progress by getting the bottom thigh closer to your chest with the pelvis still flat on the floor — not by pulling harder from a position where your tailbone has already lifted.
What goes wrong
The errors that show up most often, and the cue that fixes each one.
Move both hands behind the bottom thigh and pull only there. The crossed knee is a hinge, not a handle — levering on it torques the joint sideways and finds the ligaments rather than the glute.
Rest your head on a folded towel and keep it there for the whole hold. If you cannot reach the bottom thigh without curling up, loop a belt or towel around it and pull on that instead.
Reduce how far you pull the thigh in and push the crossed knee further out to the side instead. Front-of-hip pinching means you are running out of joint space at the front, and more flexion only jams it harder.
Do both sides every time, same duration. Then hunt the cause: a hip that stays tight through weeks of stretching is usually asking for single-leg strength work, not more range.
Why bother
Gluteus maximus and the deep external rotators underneath it only lengthen when the hip is both flexed and externally rotated. Crossing the ankle over the far knee sets the rotation; pulling the bottom leg in adds the flexion. Neither half does much alone, which is why a plain knee-to-chest pull feels like nothing in comparison.
Lying on your back takes the lumbar spine out of the equation. In a seated or standing figure-four you can cheat range by rounding forward, and most people do. Here the floor holds your pelvis flat, so whatever range you feel is coming from the hip itself.
Where it fits
After lower-body training, or on any day that ended with several hours of sitting. Two holds of 20-30 seconds per side. If the tight side is also the side that aches under load, do the stretch and then do single-leg glute work — the tightness usually outlasts the stretching if nothing gets stronger.
If this one isn't it
No kit, too hard, or too easy — here's where to go instead.
Same job, different kit
Start here instead
When this gets easy
Asked and answered
I cannot reach my bottom thigh. What do I do?
Do it with your bottom foot still on the floor, or against a wall. Lie with your hips a foot from a wall, place the bottom foot flat on the wall and cross the ankle over — the wall does the job your hands cannot, and you control range by shuffling closer or further away. A towel looped round the thigh works too.
Is this the same as a piriformis stretch?
Roughly, but the label is optimistic. Piriformis is one of six deep rotators sitting under a large glute maximus, and you cannot isolate it with a stretch. Call it what it is — a deep hip rotator and glute stretch — and judge it by whether the back of the hip feels better, not by which muscle you think you hit.
Will this help my sciatica?
Sometimes, and sometimes it makes it worse. If the symptoms are local tightness in the buttock, this often helps. If you get shooting pain, numbness or tingling below the knee, the stretch is tensioning an already irritated nerve and you should stop and get it looked at rather than persisting.
How is this different from a seated figure-four at my desk?
The seated version lets you round your back to fake range, and most people do exactly that. On the floor your pelvis is pinned, so what you feel is genuine hip movement. The seated one is more convenient; this one is more honest.