Stomach Vacuum: How to Do It and What It Does
The stomach vacuum is a deep core drill made famous by classic bodybuilders. Here's how to do it properly and what it can realistically do for your waist.
A stomach vacuum is an exercise where you exhale fully and then pull your belly button in toward your spine as far as you can, holding that drawn-in position for several seconds. It mainly trains your transverse abdominis, the deep corset-like muscle underneath your six pack. It can improve your control over your midsection and how "tight" your waist looks when relaxed, but it won't burn belly fat or shrink your waist on its own.
Below you'll find the exact technique, what the exercise realistically does, who should be careful with it, and a simple progression plan.
What muscles does the stomach vacuum work?
The main target is the transverse abdominis (TVA). It wraps horizontally around your torso like a belt, and when it contracts it pulls your abdominal wall inward. It works together with your diaphragm, pelvic floor and the small muscles along your spine to stabilize your trunk.
Your rectus abdominis and obliques contribute a little, but the vacuum is primarily a deep core skill. If you want the full picture of these muscles, read our guide to deep core training.
What a stomach vacuum can and can't do
Expectations matter here, because this exercise attracts a lot of hype.
| Claim | Reality |
|---|---|
| "Burns belly fat" | No. You can't spot-reduce fat. Fat loss comes from an overall calorie deficit. |
| "Shrinks your waist by inches" | Unlikely in a measurable way. It may help you hold your stomach in more easily, which can change how your midsection looks. |
| "Improves deep core control" | Plausible. Practicing a skill tends to improve your ability to do it. |
| "Helps with posture and a flatter-looking stomach" | Can help some people become more aware of their abdominal wall, especially combined with general core training. |
| "Replaces regular ab training" | No. It doesn't build your six pack muscles much. |
Think of it as a useful accessory drill, not a shortcut.
How to do a stomach vacuum: step by step
Start on all fours, which most people find easiest, then progress to other positions.
- Get on your hands and knees with your hands under your shoulders and knees under your hips. Keep your back flat.
- Take a normal breath in through your nose.
- Exhale slowly and completely through your mouth, pushing out as much air as you comfortably can.
- Without breathing in, draw your belly button up and in toward your spine as far as possible. Imagine trying to make your waist as narrow as it can be.
- Hold that position for 10-15 seconds. If you need air, take small, shallow breaths through your nose while keeping the stomach pulled in.
- Relax, breathe normally for a few breaths, and repeat.
Cues that help
- "Zip up your stomach from the pubic bone to the rib cage."
- Keep your shoulders and ribs still. The movement should come from your abdomen, not from hunching.
- Don't suck in by lifting your chest. That's a different action and doesn't train the TVA well.
Positions from easiest to hardest
| Level | Position | Why |
|---|---|---|
| 1 | Lying on your back, knees bent | Gravity helps your belly fall inward |
| 2 | All fours (quadruped) | Gravity pulls your belly down, so you have to work against it |
| 3 | Kneeling upright | Requires more control with an upright trunk |
| 4 | Seated on a bench | Harder to isolate without leaning |
| 5 | Standing | The most functional and the hardest to hold |
Move up a level when you can comfortably do 5 holds of 20 seconds in your current position.
A beginner progression plan
Do vacuums 3-5 days a week. They're low-fatigue and take only a few minutes. Many people like doing them first thing in the morning on an empty stomach, because a full stomach makes them uncomfortable.
- Weeks 1-2: Lying on back. 3-5 holds of 10-15 seconds.
- Weeks 3-4: All fours. 4-5 holds of 15-20 seconds.
- Weeks 5-6: Kneeling. 4-5 holds of 20 seconds.
- Weeks 7+: Seated or standing. Build toward 30-60 seconds total time under contraction per hold, using small breaths.
Use the plank timer or the interval timer if you want to track holds and rest without staring at a clock.
How to fit vacuums into a full core routine
Vacuums are a skill drill. Pair them with exercises that load your abs and teach bracing:
- Stomach vacuum: 3 x 15-20 seconds
- Dead bug: 3 x 8 per side
- Reverse crunch: 3 x 10-15
- Side plank: 2 x 30 seconds per side
That covers deep core, anti-extension, flexion and lateral stability. For more on these, see the dead bug and side plank guides.
Vacuums are not the same as bracing
This trips a lot of people up. A vacuum draws your stomach in. Bracing for a heavy squat or deadlift stiffens your whole trunk by tensing all around, often with your belly pushing slightly out against a belt. Don't do a vacuum under a heavy barbell. Our article on breathing and core bracing explains the difference.
Who should be careful with stomach vacuums
Get advice from a doctor or physical therapist before trying vacuums if you:
- Are pregnant or recently postpartum
- Have or suspect diastasis recti (see diastasis recti and ab training)
- Have high blood pressure, a heart condition or a hernia
- Get dizzy or lightheaded holding your breath
Stop if you feel dizzy, and never strain hard while holding your breath. Short, shallow nose breaths during the hold are fine.
Common mistakes
- Not exhaling fully first. Air in your lungs limits how far your stomach can draw in.
- Hunching forward. Rounding your upper back looks like a vacuum but isn't one.
- Holding too long, too soon. Quality holds of 10-15 seconds beat a shaky 60-second attempt.
- Doing them after a big meal. Uncomfortable and less effective.
- Expecting fat loss. If your goal is a smaller waist, the bigger levers are a calorie deficit and overall training. The TDEE calculator is a good starting point for figuring out your intake.
Where AbShred fits
AbShred, an iPhone app that's coming soon, estimates a Deep Core score along with five other ab zones from a single photo, then builds a weekly plan that starts with your weakest one. If Deep Core shows up as a lagging zone, drills like the vacuum and dead bug are the sort of work you'd prioritize. It's an AI estimate for motivation, not a medical measurement. Join the waitlist.
FAQ
How long does it take for stomach vacuums to work?
Most people notice better control over their abdominal wall within a few weeks of regular practice. Visible changes in your waist depend much more on body fat than on vacuums.
Can I do stomach vacuums every day?
Yes, for most healthy people. They're low intensity and quick to recover from. A few minutes daily or 3-5 times a week works well.
Do stomach vacuums get rid of a pooch?
A lower belly pooch is usually a mix of body fat, posture and how relaxed your abdominal wall is. Vacuums may help with control, but fat loss and overall core training tend to make the bigger difference.
Should I do vacuums standing or lying down?
Start lying down or on all fours, where it's easier to feel the contraction. Progress to kneeling and standing once you can hold a strong contraction for 20 seconds.