A common cue, and what I mean when I say it.
You may hear me say "navel toward spine." You've also heard it in Pilates, barre, yoga, and nearly every core class. Without context, it sounds like sucking in your stomach and holding it. That isn't what I mean, and the difference is the breath.
What the short version gets right
The deep abdominal muscles are real, and they matter. The transversus abdominis is the deepest layer of the abdominal wall. It wraps around the trunk like a belt and works with the diaphragm (the dome-shaped breathing muscle under the lungs) and the pelvic floor (the muscles at the base of the pelvis) to manage pressure inside the abdomen. Drawing the navel in is a simple, familiar way to find it.
Breath is the best way to find it, too, because these muscles are most active as you exhale. In one study, deep abdominal activity was highest when people breathed out while actively tightening the waist and drawing the navel in, and lowest when they breathed out passively. In another, Pilates-style breathing increased activity in the transversus abdominis, the internal oblique (the muscle layer just outside it), and the multifidus, a small muscle that runs along the spine. Both studies were small, used healthy people, and tested them lying down, so they show a pattern and don't settle the question. I give more weight to what I've seen over decades of teaching and practicing the cue, which is what the rest of this post covers.
What the short version leaves out
Without a breath attached, "navel toward spine" is easy to hear as "suck in your stomach and hold it." Held that way, a drawn-in belly leaves less room for the diaphragm and ribs to move, which can make a full breath harder. It also tends to arrive with a tucked pelvis and a flattened low back (the lumbar spine losing its natural curve), which is the pattern I wrote about in the imprint post.
Held without a breath, drawing the belly in can make breathing harder.
There's also a real disagreement in the research. In some research on spine stability, bracing the whole abdominal wall gave more stability than hollowing the belly in. Other studies favor drawing in for movement control, and the results don't line up. No study has shown that one approach is right for everyone. What the cue should specify, and often doesn't, is when to do it, how much, and for how long.
Where it came from
The cue has several homes. In rehabilitation, drawing the belly in is called the abdominal draw-in maneuver, and it has been taught for decades as a way to train the deep abdominal muscles. Pilates and barre carry it into group classes, with some versions tied to the exhale and others not. In yoga, it shows up in many lineages and many wordings: navel to spine, scoop, hollow, pull the belly in.
Iyengar-style teaching is less consistent. Depending on the pose, you may hear the abdomen soften and release, or you may hear it drawn back toward the spine. Both instructions exist in the method, and the pose usually decides which one applies.
The same words can mean a light draw on an exhale in one room and a held grip in another.
What I actually cue
I cue it on the exhale. As the breath leaves, the navel draws toward the spine and then up, like a zipper closing in and up. On the inhale, it releases, so the ribs and belly can move with the breath. The exhale carries the action.
I never hollow the belly. Hollowing means scooping it in deeply and holding it there. This cue is a gentle draw that arrives with the exhale and releases with the inhale.
Try This
Five breaths, lying on your back with your knees bent, or seated in a chair. This is a gentle test. Use light effort and never force the draw or the breath.
Who should try it: people who are generally comfortable with gentle breathing and abdominal work. If you have current abdominal or pelvic pain, have had abdominal or pelvic surgery, have a hernia, are pregnant or postpartum, or have movement restrictions from a clinician, skip it or check with your clinician first.
Rest one hand on your lower belly and the other on your lower ribs.
Inhale through your nose. Feel the ribs and belly widen a little under your hands.
Exhale slowly, as if fogging a mirror. As the breath leaves, let your navel draw gently toward your spine and then up, like a zipper closing from the pubic bone toward the ribs. Leave your low back where it is, without pressing it into the floor.
Inhale and let everything release. Repeat for five breaths.
Ease off if you catch yourself holding your breath, tucking your pelvis, pressing your low back down, or scooping the belly in and keeping it there.
Stop right away if you feel pain, pressure in your pelvis or abdomen, dizziness, or any bulging in your belly.
What backs this up
Here is where each part comes from.
Supported by research: Exhaling brings in the deep abdominal muscles. In one study, deep abdominal activity was highest when people breathed out while actively drawing the navel in. In another, Pilates-style breathing increased activity in the transversus abdominis, the internal oblique, and the multifidus (the deep muscles around the trunk and along the spine). These studies were small and tested healthy people lying down.
Where research and clinicians disagree: Some research found that bracing the whole abdominal wall gave more spine stability than hollowing the belly in, while other studies favor drawing in for movement control. Clinicians also report that a belly pulled in and held makes full breaths harder, and I found no trials that test that.
From my own teaching and practice: I've taught and practiced the exhale-led version for decades, and I can see and feel the difference between it and the held hollow. That experience is why I teach it this way.
The breath is what separates this cue from a held hollow. Draw on the exhale, release on the inhale, and if you can't breathe and talk normally while you do it, ease off.