Flexi Stretch
What the hip flexors actually are
"Hip flexors" is shorthand for a group — mainly the psoas and iliacus running from your lower spine and pelvis to the top of your thigh bone, plus rectus femoris, the quad muscle that crosses both the hip and the knee. Together they lift your knee towards your chest.
Sitting holds all of them in a shortened position for hours at a stretch. Over time they adapt to that length, and when you stand up they quietly pull the front of your pelvis downward. Your lower back arches to compensate, your glutes work less, and your stride shortens.
Signs yours are tight
- Lower back aching after standing or walking, rather than after sitting
- A pinch at the front of the hip when you bring a knee up
- Difficulty getting a proper stretch at the front of the thigh, however you try
- Glutes that feel switched off — you feel squats and bridges in your quads and back
- A visible forward tilt to your pelvis when you stand relaxed side-on to a mirror
Tight hips are a back problem in disguise. If lower back stiffness is your main complaint, pair this routine with the lower back guide — they are two halves of the same fix.
Four stretches
Thirty seconds each side, in this order. Roughly ten minutes with both sides.
30 seconds each side
1. Kneeling hip flexor stretch
Kneel on your right knee, left foot forward, both at right angles. Squeeze your right glute and tuck your tailbone under — you should feel the stretch appear at the front of the right hip before you move at all. Then shift your weight forward an inch or two. That is the whole range you need.
30 seconds each side
2. Couch stretch (against a wall)
From the same kneeling position, place the top of your back foot up against a wall or sofa behind you. This adds the quad and rectus femoris to the stretch. Intense — reduce the angle or skip it if the kneeling version is still difficult.
30 seconds each side
3. Figure-four glute stretch
Lie on your back, cross the right ankle over the left thigh, and draw the left thigh towards you. Hip flexors and glutes are opposites; releasing one while the other stays locked gets you halfway at best.
30 seconds each side
4. Side-lying IT band stretch
Lie on your left side, top leg drawn back and dropping behind you. Works the outside of the hip and thigh, which tightens alongside everything else when you sit — and it is a calm one to finish on.
The mistake almost everyone makes
In a kneeling hip flexor stretch, the instinct is to lunge forward hard to feel something. What that actually does is arch your lower back — your pelvis tips forward, the hip flexor stays exactly as short as it was, and you feel a vague pull in your spine that you mistake for progress.
Tuck the tailbone first. Posterior pelvic tilt, glute squeezed, then a small forward shift. A well-executed kneeling stretch barely looks like movement from the outside and feels far stronger than the aggressive version.
Common questions
How long does it take to loosen tight hip flexors?
You will feel a difference within a session. Changing the resting length of muscles that have adapted over years takes consistent daily work — most people notice a real shift somewhere between four and eight weeks.
Should I stretch my hips before or after running?
After, or as a separate session. Before a run, do dynamic work — leg swings, walking lunges, a few minutes of easy jogging. Long static holds immediately beforehand can slightly blunt power output.
My knee hurts during the kneeling stretch. What now?
Put a folded towel or cushion under it. That is almost always a floor-pressure problem rather than a knee problem. If pain continues even with padding, stop and get it looked at.
Is there a guided version?
Yes — Flexi's Hip Flexors plan runs this routine with timed holds, illustrations for each position and voice cues, so you can focus on the tailbone tuck instead of the clock.