The powerhouse is the Pilates name for your center: broadly, the muscles from the pelvic floor up to the ribcage, including the deep and outer abdominals, low back, hip muscles and pelvic floor. Centering, the idea that movement is organised from this center, is a core Pilates principle. Engaging it means a gentle, sub-maximal tightening of the deep abdominal wall and pelvic floor that you hold while you keep breathing, not a hard clench. Muscle engagement is invisible to the camera: from the side it can only watch whether your trunk and hips stay still while your arms and legs move, so the hand and breath checks in this lesson matter most.
Find the deep core
Lie on your back in neutral: knees bent, feet hip-width apart on the mat, arms long by your sides, palms down.
your weight resting evenly on the back of your pelvis and ribs.
Breathe in through your nose and let your ribs widen to the sides and back, not just the upper chest. Your belly can rise slightly; keep a light hold in the abdominal wall.
your back ribs pressing gently into the mat as you inhale.
Put your fingertips just inside the bony points at the front of your hips. As you breathe out, gently tighten the deep abdominal wall until it feels taut under your fingers. Nothing should bulge out into your fingertips.
a light, flat firmness under your fingers, not a push outward.
Lift the pelvic floor
On the same exhale, gently draw the pelvic floor in and up. STOTT Pilates links the two: a deep pelvic floor contraction brings the deep abdominal wall in with it. Lift, never bear down.
a soft lift from underneath that joins the firmness at the front.
Engage, don't clench
Keep the effort well below your maximum. Teachers cue this differently. Pilates Anatomy (Isacowitz and Clippinger) uses "draw the navel toward the spine" or "scoop" to stop the belly bulging. STOTT Pilates asks you to avoid hollowing or pulling the navel in, and aims for a flat, taut feel instead. Both agree: no bulging, no hard suck-in. Use the cue your teacher uses.
engaged but soft.
Breathe in again and keep the engagement. Don't hold your breath. Let your ribs close in and down as you breathe out, but don't force them down so hard that your upper back rounds.
you can keep breathing fully with the hold on.
Set the breath and the engagement before you move an arm or leg, then keep them while the limb moves. Only move as far as your hips and ribs stay still.
the limb moves and your center stays quiet.
Feel it
A light, steady firmness low in the belly and a gentle lift from the pelvic floor, held while you keep breathing into your ribs. Your hands should feel the wall go taut, not bulge. If your neck, shoulders or glutes are working hard, you are gripping too much. Research on deep-core cues is still mixed: a 2024 review of 22 trials found both gentle hollowing and fuller bracing improved trunk stability measures, with no clear winner. The camera can't see any of this muscle work. It can only show whether your trunk and hips stay still while your limbs move. If you have pelvic pain, leaking, or are pregnant or postpartum, get advice from a qualified health professional before training the pelvic floor.
Fix-its
- Your belly bulges out when you engage Keep your fingertips inside your front hip bones and ease the effort down until the wall goes taut and flat under your fingers with no push outward.
- You clench hard or hold your breath Drop to a gentle, sub-maximal effort. Breathe in through your nose into your side and back ribs while keeping the hold.
- You suck the belly in hard Ease off. Aim for a flat, firm wall, not a deep hollow. You should still be able to breathe into your belly slightly.
- Your ribs pop up when your arms go overhead Only take your arms as far as your back ribs stay in contact with the mat, then bring them back.
- You tuck your pelvis and squeeze your glutes Let your pelvis settle back to neutral. Pressing your low back flat with the outer abs and glutes is not the goal and may make you less stable.
Drill
- Supine breathing: lying on your back in neutral, breathe in through your nose into your whole ribcage. Breathe out, first gently engaging the pelvic floor and deep abs, then let the side abs help push the last air out. Repeat for several slow breaths.
- Fingertip check: fingertips just inside your front hip bones. On each exhale, tighten gently until the wall goes taut under your fingers with no bulge. Release on the inhale. Repeat until you can find it without searching.
- Leg slides: hold the engagement, breathe in as you slide one foot away along the mat, breathe out as you slide it back. Only slide as far as your pelvis stays still. Alternate legs.
- Arm raises: breathe in and reach your arms to the ceiling. Breathe out and reach them overhead only as far as your back ribs stay on the mat and the engagement holds. Breathe in back to the ceiling, out to lower them.
- Film from the side at hip height with your whole body in frame during leg slides and arm raises to check that your hips and ribs stay still.
Sources
- Merrithew / STOTT PILATES — Five Basic Principles brochure (2017)
- Isacowitz R, Clippinger K — Pilates Anatomy, 2nd ed., excerpt: Putting alignment into action in Pilates mat work (Human Kinetics)
- Muscolino JE, Cipriani S — Pilates and the "powerhouse" I, J Bodyw Mov Ther (2004)
- Golob I, Opara Zupančič M, Kozinc Ž — Abdominal Hollowing vs. Abdominal Bracing: A Scoping Review, J Funct Morphol Kinesiol (2024)
- Sapsford RR, Hodges PW et al. — Co-activation of the abdominal and pelvic floor muscles during voluntary exercises, Neurourol Urodyn (2001)
Last checked 2026-10-26.