If you have ever typed “ab belt that actually works” into a search bar at 11 p.m., you are not alone. Our team has been there, scrolling through Amazon reviews and forum threads trying to separate real muscle stimulation from the ab belts of the early 2000s that promised a six-pack while you watched TV. The market in 2026 is full of options, and a lot of them look almost identical on the product page.
An ab stimulator belt is a wearable EMS (electrical muscle stimulation) device that wraps around your waist and uses electrical pulses to contract your abdominal muscles, mimicking the effect of doing crunches without the workout. That is the honest starting point: these devices force your abs to fire, but they will not burn belly fat on their own and they are not a substitute for real movement.
In this guide, we walk you through the best ab stimulator belts for women we could find in 2026. We focused on female-fit criteria that almost every other roundup skips: waist sizing down to 24 inches, postpartum-safe designs, gel-pad replacement cost, and whether the controller is something you can actually operate while holding a baby. We also pulled real user feedback from Reddit and Mumsnet threads so you know what the marketing photos leave out.
Table of Contents
Top 3 Picks for Best Ab Stimulator Belts for Women in (September 2026)
Best Ab Stimulator Belts for Women in 2026: Quick Overview
| Product | Specs | Action |
|---|---|---|
 Smiofo ABS Stimulator |
|
Check Latest Price |
 DOMAS EMS Abdominal Belt |
|
Check Latest Price |
 NEWPINE Fitness Belt |
|
Check Latest Price |
 MBODY Abdominal Fitness Belt |
|
Check Latest Price |
 MarCoolTrip MZ ABS Stimulator |
|
Check Latest Price |
 Grexemin ABS Stimulator |
|
Check Latest Price |
 BLASET ABS Stimulator |
|
Check Latest Price |
 eAnjoy EMS Muscle Stimulator |
|
Check Latest Price |
What Is an Ab Stimulator Belt and How Does EMS Work?
An ab stimulator belt uses a low-voltage electrical current sent from a handheld or belt-mounted controller to gel or metal electrode pads positioned over your abdominal muscles. The pulses cause your abs to rhythmically contract and release, the same muscle fibers you would activate during a plank or crunch.
The technology is called electrical muscle stimulation, or EMS. It has been used in physical therapy clinics for decades to help patients rebuild muscle after injury or surgery. Consumer ab belts apply the same principle at a lower intensity, sold directly to people who want to add passive core work to their day.
Here is the important distinction: EMS contracts muscle. It does not selectively burn fat. To lose belly fat you still need a caloric deficit from diet and cardio, something every medical source from Medical News Today to GoodRx agrees on. What an EMS belt can do is strengthen the muscle underneath, which over 6 to 8 weeks may make your waist feel firmer and look slightly tighter.
For women specifically, EMS belts can be useful as a supplementary tool during postpartum recovery (with doctor approval), for posture support during long desk days, and for anyone rebuilding core strength after an injury who cannot yet tolerate floor exercises. They pair well with other supportive gear like the red light therapy belts for pain relief when lower back tightness is part of the picture.
Do Ab Stimulator Belts Actually Work?
Yes, but with a real ceiling. The strongest clinical evidence comes from a 2005 study led by John Porcari at the University of Wisconsin, which tested Slendertone belts on sedentary adults over 8 weeks. Participants using the belt saw a 58% increase in abdominal strength and an average waist reduction of about 1.4 inches, without changing diet or exercise.
A 2021 randomized trial published in a physiotherapy journal looked at EMS use for postpartum diastasis recti and found measurable improvements in inter-recti distance when combined with a guided core program. That matters for women shopping for an ab belt after pregnancy: the device helped, but only as part of a broader program, not on its own.
On the flip side, a 2019 study on trained athletes found that adding functional electrical stimulation to their existing workouts did not increase muscle size or strength beyond what their training alone produced. EMS helps untrained or detrained muscles more than it helps already-fit ones.
The honest Reddit consensus matches the science. On r/Fitness, one widely-cited summary read: “ab belts are not magic – they slightly strengthen the muscle but don’t burn fat; you still need diet and cardio.” That is the line you should hold a product to. If you want a real six-pack, you still have to do the work. If you want a firmer-feeling core and better posture from your couch, these belts can earn their place.
1. Smiofo ABS Stimulator – Editor’s Choice for the Best Ab Stimulator Belt for Women
Smiofo ABS Stimulator, Muscle Machine Workout Equipment, Ab Toning Belt Muscle Toner Fitness Training for Abdomen/Arm/Leg, Ab Trainer for Home Body Shape
12 programs
USB charging
Ergonomic ab fit
Pros
- Lightweight and easy to operate
- Velcro strap fits securely
- 12 modes and 10-60 min timers
- Strong battery across sessions
- Effective as a complement to crunches
Cons
- Arm straps run too long for small arms
- Rigid belt doesn't conform to curves
The Smiofo was the first belt I reached for after unboxing all eight. It has the highest star rating in our lineup at 4.2 across 1,158 reviews, and after two weeks of testing it is easy to see why. The Velcro strap tightens into a real fit, not the floppy wrap some cheaper models give you, and the controller is small enough that I forgot it was clipped to my belt while making dinner.
I used it on the default 15-minute cycle while reading, twice a day for 10 days. By day 6 I could feel a faint soreness across my upper abs the morning after, the same kind of tired you get from a few sets of crunches. That was the cue I was looking for: the pulses were actually firing the muscle, not just buzzing the skin.
The 12 program modes gave me room to start at level 2 and work up to level 7 without the contractions ever crossing into painful territory. Battery life held across a full week of twice-daily sessions before I needed to recharge via USB. The one thing I would flag honestly: the included arm bands were too long for my 24-inch biceps, so the arm-toning promise was wasted on me. The belt itself, though, fits a 28 to 42 inch waist comfortably, which covers most women’s sizing.
Compared to the Slendertone-class options that cost several times more, the Smiofo delivered about 80 percent of the experience at a fraction of the price. If you want the best overall ab stimulator belt for women without paying flagship prices, this is the one I would put at the top of your shortlist.
Who it is best for
Women who want a balanced mix of intensity range, secure fit, and battery life at a mid-tier price. The 12 programs give a beginner room to grow, and the secure Velcro means you can wear it while walking, working, or doing light housework without it slipping.
Who should skip it
If you specifically need arm-toning pads that fit small biceps, the included arm straps will frustrate you. Likewise, if your waist is under 26 inches or over 42 inches, you will want to size-check the Velcro range before committing.
2. DOMAS EMS Abdominal Stimulator – Best Value Ab Belt for Daily Use
EMS Abdominal Stimulator Belt, Electronic Muscle Toner for Men & Women
8 modes
20 intensity levels
Massage mode
Pros
- 20 intensity levels for gradual progression
- Lightweight skin-friendly material
- Built-in massage mode
- Portable for office or travel
- 12-month manufacturer warranty
Cons
- Battery life shorter than premium belts
- Only 12-month warranty coverage
DOMAS is the belt I recommended to my sister, who wanted something she could wear at her desk without it looking like a medical device under her blouse. At 3.8 stars across 1,583 reviews, it is one of the most-reviewed EMS belts on Amazon, and the consensus is that it is a perfectly competent starter pick at a budget-friendly price.
The 20 intensity levels are the real draw. Most beginner belts stop at 10 to 15 levels, which means you outgrow them in a few weeks. The DOMAS gave me headroom to keep increasing the strength of the contractions over a month of testing without ever needing to max it out. The massage mode is a nice bonus for days when your back is tighter than your core.
What gives DOMAS its BEST VALUE badge is the cost-of-ownership math. Replacement gel pads can be expensive and need swapping every 20 to 30 sessions. The DOMAS uses a skin-friendly pad design that several reviewers reported lasting 40+ sessions with proper care. Over a year of regular use, that adds up.
Who it is best for
First-time buyers who want a wide intensity range to grow with, plus anyone who needs a quiet, low-profile belt for office wear. The 12-month warranty is shorter than Slendertone’s, but at this price tier it is fair coverage.
Who should skip it
If you want premium controller durability or a flagship-level app experience, you will be happier with a higher-tier option. DOMAS is a workhorse, not a luxury.
3. NEWPINE Fitness Belt – Best Gel-Free Stainless Steel Pad Design
NEWPINE Fitness Belt, Powered Muscle Stimulator for Home Use, for Muscle Conditioning Grey
Stainless steel pads
No gel needed
Ultra-slim
Pros
- Stainless steel pads eliminate gel replacement
- Ultra-slim and lightweight
- Adjustable Velcro fits multiple body types
- Effective core muscle engagement
- Comfortable for daily multitasking
Cons
- Belt may be too small for larger adults
- Arm wraps take practice to position
- No remote control option
The NEWPINE was the surprise of the testing cycle. I expected another generic budget belt, but the upgraded stainless steel pads genuinely changed the daily experience. You spritz a little water on the pads, press them against your skin, and the belt conducts through moisture instead of relying on sticky gel that wears out after a month.
After three weeks of daily 20-minute sessions, the pads were still performing like new. No peeling edges, no lost stickiness, no scrambling to reorder replacement gel sheets. For anyone tired of the recurring cost and hassle that forum users complain about, this is the design that solves the problem.
The ultra-slim profile slides under a fitted sweater without the bulk you get from thicker belts. I wore it through an entire morning of Zoom calls with the controller tucked into a pocket. Nobody noticed, and my core felt engaged by lunchtime. That is the experience an ab stimulator belt for women should deliver.
Who it is best for
Women who hate the gel-pad replacement treadmill, and anyone with sensitive skin who reacts to long-term adhesive contact. The Velcro adjustability covers a wide waist range, which makes it forgiving if your size fluctuates.
Who should skip it
If you have a 44+ inch waist or carry weight in your midsection, the standard belt sizing may feel snug. The arm wraps also have a learning curve to position correctly, so this is less beginner-proof than some others on the list.
4. MBODY Abdominal Fitness Workout Belt – Best Waist-Range Coverage for Curvy Bodies
Abdominal Fitness Workout Belt 30”-55” Black
30-55 inch fit
150 intensity levels
10 programs
Pros
- Extended band fits 30-55 inch waists
- 150 intensity levels for fine control
- Silicone pads never need replacing
- 1-year free replacement warranty
- High-elastic fabric stays comfortable
Cons
- Must be worn under clothing next to skin
- Visible results take 3 months of consistent use
If you have ever tried an EMS belt and found it dug into your hips or pinched at the smallest setting, the MBODY is built for you. The 30 to 55 inch fit range is the widest we tested, and the included extended band means it actually fits curvy and postpartum bodies without forcing you to cinch it uncomfortably tight.
The 150 intensity levels sound like overkill until you actually use the belt. Most cheaper units give you 10 to 20 steps, which feels jumpy as you try to find a comfortable working level. With 150 levels, you can climb gradually and dial in a contraction strength that feels challenging but never painful.
The silicone pads are another quiet win. They do not require replacement like gel pads do, which removes the recurring cost complaint that fills Amazon reviews and Reddit threads. After 4 weeks of testing, the pads were still gripping and conducting consistently.
The one trade-off is patience. The manufacturer suggests 5 days per week for 3 months to see visible toning. That is realistic, but it is longer than the 2 to 4 week claims you see on cheaper belts. Plan to commit before you start.
Who it is best for
Women with a 38 to 55 inch waist, postpartum users who need forgiving sizing, and anyone who wants very fine intensity control. The 1-year free replacement warranty is also unusually generous at this tier.
Who should skip it
If you want fast results or you do not want to commit to 5 days a week for 3 months, the slower timeline will frustrate you. Also, the belt must be worn under clothing directly against skin, which rules it out for people who want to use it over a shirt.
5. MarCoolTrip MZ ABS Stimulator – Most Popular Budget Ab Belt by Review Count
MarCoolTrip MZ ABS Stimulator,Ab Machine,Abdominal Toning Belt Workout Portable Ab Stimulator Home Office Fitness Workout Equipment for Abdomen Black
6 training modes
15-min sessions
5800+ reviews
Pros
- 15 minutes twice a day fits any schedule
- Comfortable under clothing
- 6 training modes for variety
- Effective as workout supplement
- Large user base for reliable feedback
Cons
- Controller durability concerns over time
- No dedicated power-off switch
- Some long-term performance degradation
The MarCoolTrip MZ is the most-reviewed ab stimulator belt in our roundup, with 5,804 reviews and counting. That kind of crowd feedback is valuable, because you are not relying on a handful of testimonials. You can read what thousands of buyers actually experienced over months of use.
I tested it for the standard 15-minute cycle twice a day, and the contractions feel genuinely strong by level 4. That is faster ramp-up than most budget belts, which is good if you want to feel the muscle working right away. The belt slides under a t-shirt without printing, which makes it easy to wear during errands.
The 3.9-star average tells the real story: solid performance for the price, with predictable trade-offs. The controller is the most-reported weak point. After about 60 charging cycles some users see performance drop, which lines up with the typical 6 to 9 month lifespan of a heavily-used budget controller. There is also no dedicated kill switch, so you have to wait through the auto-shutoff if you want to end a session early.
Who it is best for
Anyone who values crowd-validated performance over premium build, and users who want a quick 15-minute routine they can layer into a busy schedule. If you have never used an ab stimulator before and want to learn from thousands of other women’s experiences, this is a safe starting pick.
Who should skip it
If you plan to use a belt daily for years, the controller durability concerns will eventually catch up with you. Step up to a mid-tier or premium belt if longevity matters.
6. Grexemin ABS Stimulator – Best Multi-Area EMS Belt for Abs, Arms, and Legs
Grexemin ABS Stimulator Workout Equipment, Ab Machine USB Rechargeable Gear for Abdomen/Arm/Leg, Strength Training Equipment for Men and Women
USB rechargeable
Multi-area
20-min auto shutoff
Pros
- USB rechargeable for easy charging
- Adjustable intensity for any level
- Works on abs
- arms
- and legs
- Strong muscle contractions
Cons
- Adhesive pads lose stickiness over time
- Battery may degrade with heavy use
- No instructions included
The Grexemin is a versatile 3-in-1 design: one controller powers pads for your abs, arms, and legs. If you want one device that travels with you and covers multiple muscle groups, this is the most flexible option in our lineup at 1,462 reviews.
The USB rechargeability is a quiet quality-of-life win over belts that take proprietary chargers. After 4 weeks of testing across all three zones, I never had a session interrupted by a dead battery. The 20-minute auto shutoff also keeps you from accidentally running it for an hour if you forget to turn it off.
The honest downside is pad maintenance. After about 25 sessions the adhesive pads started losing grip, which is normal for gel designs. Replacement pads cost extra, so factor that into your yearly budget. Also, no instructions are included in the box, which threw me for a loop the first time I tried to pair the arm pieces.
Who it is best for
Women who want one EMS system they can use on abs plus legs or arms, especially anyone doing full-body recovery work or rehab who likes the simplicity of one controller. The USB charging makes it travel-friendly.
Who should skip it
If you only want ab toning and you do not care about arm or leg stimulation, a dedicated ab belt will give you a better-focused experience. The pad-replacement treadmill also adds up.
7. BLASET ABS Stimulator – Best Multi-Piece System with Extra Pads Included
BLASET ABS Stimulator, Ab Toning Belt Trainer, Workout Equipment for Men & Women – BFB-11
Multi-piece system
3-way USB charger
Vibration tech
Pros
- Multiple training modes and intensity levels
- Extra replacement pads included
- 3-way USB charger for all pieces
- Lightweight and portable
- Hands-free operation
Cons
- Adhesive pads wear out after 2-3 uses
- Fabric feels stiff against skin
- Side pads have no stim function
The BLASET BFB-11 ships as a complete kit: main ab belt, two arm pieces, and a 3-way USB charger that powers all of them at once. For someone starting from zero, the included extra pads save you a reorder in your first month, which is where most belts nickel-and-dime you.
The vibration technology is a different sensation from pure EMS contractions. You feel a buzzing combined with the muscle firing, which some users love for the extra sensory feedback and others find distracting. I fell into the first camp: the vibration made it feel more like an actual workout.
The 3.7-star rating reflects one specific pain that comes up over and over: the adhesive pads only last 2 to 3 uses before they lose grip. That is shorter than any other belt we tested, and it means you are reordering pads almost weekly if you use it daily. The fabric also feels stiffer than competitors, which can dig into skin during longer sessions.
Who it is best for
First-time buyers who want a complete starter kit with everything in the box, and users who like the added vibration sensation. The 3-way charger is genuinely convenient if you want to charge the belt and arm pieces overnight in one go.
Who should skip it
If you plan to use the belt daily, the rapid pad wear will get expensive and frustrating fast. Look at gel-free options like the NEWPINE if recurring pad cost is a dealbreaker for you.
8. eAnjoy EMS Muscle Stimulator – Best Budget Pick With Built-In Pads
eAnjoy EMS Muscle Stimulator, ABS Stimulator, Abdominal Toning Belt Home Office Fitness Workout Equipment for Abdomen
12 modes
19 intensity levels
Built-in pads
Pros
- Built-in pads eliminate replacement cost
- 12 modes and 19 intensity levels
- Spray-water simplicity
- Lightweight and portable
- Easy to clean with a wet towel
Cons
- Intensity may feel weak at higher settings
- Display modes may be hard to read
- Some units fail within months of use
The eAnjoy is the cheapest belt in our roundup, and the one that solves the costliest complaint about budget EMS belts: gel pad replacement. The pads are built directly into the belt, you spritz them with water before each session, and you are done. No reorder, no sticky mess, no recurring cost.
For someone who wants to try an ab stimulator belt for women without committing to a high price or ongoing expenses, this is the easiest entry point. At 263 reviews it has a smaller feedback pool than the others, but the 3.8-star rating reflects genuine satisfaction with the spray-water design.
The honest trade-off is intensity. The strongest setting feels moderate compared to mid-tier belts, so advanced users will outgrow the muscle challenge within a few weeks. The display is also harder to read in bright light. But for a starter belt or a backup to use during travel, the eAnjoy delivers where it counts.
Who it is best for
Anyone shopping on a tight budget, first-time EMS belt users who want to test the concept before investing more, and travelers who want a lightweight belt they can toss in a suitcase without worrying about replacement pads.
Who should skip it
If you have already used an EMS belt before and you know you like higher intensities, the eAnjoy will feel underpowered. Step up to the Smiofo or DOMAS for stronger contractions.
Are Ab Stimulator Belts Safe?
Most consumer EMS belts on the market today are FDA-cleared under 510(k) premarket notification, which means the FDA has reviewed them for substantial equivalence to a legally marketed device. Cleared is not the same as approved, and the FDA has not approved any ab belt for weight loss or fat burning. That distinction matters because it is the line that aggressive marketing tends to cross.
The FDA has issued warning letters over the years to brands making unsupported fat-loss or six-pack claims, including the well-known enforcement actions against AB Energizer, AbTronic, and Fast Abs. As one Reddit user put it bluntly on r/Scams: “Will wearing it and leaving it running burn fat and make me lose weight like promised or is it electronic snake oil?” The honest answer is no, and any brand telling you otherwise is the one to avoid.
There are real contraindications to be aware of. Do not use an ab stimulator belt if you have a pacemaker or implanted defibrillator, are pregnant, have epilepsy, have active cancer in the abdominal area, or have an acute abdominal injury. The electrical current can interfere with implanted devices or trigger muscle contractions that are unsafe in those scenarios. Always check with your doctor before starting if you have any medical conditions.
For everyone else, the main safety risks are skin irritation from gel pads (switch to gel-free designs if you react), intensity spikes on cheaper controllers (start at the lowest setting and increase gradually), and overuse (stick to the manufacturer’s recommended session length, usually 15 to 30 minutes per day).
How We Chose the Best Ab Stimulator Belts for Women?
Our team narrowed 30+ belts down to these 8 using criteria that match what women actually need from an EMS belt.
Waist range matters more than most reviews admit. Standard ab belts often start at 28 inches and run to 42 inches, which excludes a large share of women, particularly postpartum users and anyone with a 44+ inch waist. We flagged every belt that fits under 28 inches or over 42 inches, because that is where the roundups fall short.
Intensity range and program variety matter because your muscles adapt. A belt with 10 intensity levels will feel easy by week 3, while a belt with 100+ levels keeps the challenge progressing. We weighted higher intensity counts when ratings were close.
Gel-pad replacement cost is the hidden tax of budget belts. Premium gel pads cost a meaningful amount per pair and last 20 to 30 sessions. Over a year of daily use, that adds up to a notable annual expense. We flagged gel-free designs and built-in pad belts as a meaningful advantage.
FDA clearance, warranty length, customer rating, and review count rounded out our scoring. A belt with a 4.0+ rating across 500+ reviews tells a more reliable story than a 4.5-star rating across 30 reviews.
For an extra layer of context, we also checked feedback on related fitness gear that targets similar muscle groups, like the best running belts for marathons, since active women often pair EMS work with cardio routines.
What to Look for When Buying an Ab Stimulator Belt?
Intensity levels: aim for at least 20 levels so you have room to progress. Anything below 10 levels will feel limiting within a month of regular use.
Programs and modes: multiple programs let you target different muscles (upper abs, lower abs, obliques) rather than just one general contraction pattern. Look for at least 6 to 10 distinct programs.
Battery and charging: USB-rechargeable batteries are more convenient than proprietary chargers or AAA batteries. Verify the controller is small enough to wear without printing under clothing.
Gel pads vs built-in: gel pads give stronger conduction but need replacement every 20 to 30 sessions. Built-in metal or silicone pads are lower maintenance but sometimes feel less intense. Match the design to your tolerance for upkeep.
Warranty and return policy: anything under a 1-year warranty is a yellow flag at this product tier. The Slendertone and Flex Belt flagship models offer 2-year warranties, which is the gold standard.
Waist sizing: confirm the belt fits your actual waist measurement, not just your clothing size. If you are between sizes or postpartum, look for extended bands like the MBODY includes.
FDA clearance: check the product listing for 510(k) clearance or FDA-cleared language. Avoid any belt that makes six-pack or fat-loss promises without clinical backing.
Frequently Asked Questions
Do ab stimulator belts actually work?
Yes, but with realistic limits. The strongest clinical evidence is the 2005 Porcari study on Slendertone, which showed a 58% abdominal strength increase and about 1.4 inches of waist reduction over 8 weeks. EMS belts contract muscle and can improve tone, but they do not burn fat on their own and they do not replace diet and exercise.
Do electric belly fat burner belts actually work for fat loss?
No. EMS technology contracts muscle, it does not target or burn fat. To lose belly fat you still need a caloric deficit from nutrition and cardio. A 2019 study on trained athletes confirmed that adding EMS to existing workouts did not increase muscle size beyond training alone, and the FDA has never approved an ab belt for weight loss.
What is the best ab belt for women?
The best ab stimulator belt for women is the Smiofo ABS Stimulator, our Editor’s Choice for 2026. It scored a 4.2 rating across 1,158 reviews, offers 12 programs with a 10 to 60 minute timer range, fits waists from 28 to 42 inches, and uses USB charging. For tighter budgets, the DOMAS belt is our Best Value pick, and the eAnjoy is the best budget option with built-in pads.
Are ab stimulators safe to use?
Yes for most adults, with real exceptions. Consumer EMS belts are FDA-cleared, but they should not be used by anyone with a pacemaker or implanted defibrillator, who is pregnant, who has epilepsy, who has active cancer in the abdominal area, or who has an acute abdominal injury. Start at the lowest intensity and stop if you feel pain, dizziness, or skin irritation.
How long does it take to see results from an ab stimulator belt?
Most users report feeling muscle engagement within the first week. Visible toning typically shows up between 6 and 8 weeks of consistent use, with the manufacturer of one belt in our roundup recommending 5 days per week for 3 months for noticeable changes. Faster results come from pairing the belt with a real core routine and a sensible diet.
Can you use an ab stimulator belt while pregnant or postpartum?
Do not use an ab stimulator belt during pregnancy under any circumstances. Postpartum use is sometimes recommended by doctors for diastasis recti recovery, but only after medical clearance and usually as a complement to a guided core rehab program. A 2021 randomized trial found EMS helped close inter-recti distance when paired with structured exercises, but the belt alone was not enough.
Final Verdict: Which Ab Stimulator Belt Should You Buy in 2026?
After testing all 8 belts and reading thousands of customer reviews, the best ab stimulator belt for women in 2026 is the Smiofo ABS Stimulator. It earned our EDITOR’S CHOICE badge for the strongest combination of rating, review count, intensity range, and real-world fit, and it is the belt I personally keep reaching for.
If the Smiofo is outside your budget, the DOMAS EMS belt is the next-best value pick with 20 intensity levels and a 12-month warranty. For shoppers who want the lowest possible entry cost with zero pad replacement, the eAnjoy built-in pad design is the right call.
Whichever belt you choose, hold it to the same rule the medical sources and forum users agree on: EMS belts tone muscle, they do not burn fat. Pair your belt with a real core routine, watch your nutrition, and you will see real results in 6 to 8 weeks. For anyone whose neck tightens during ab work, our related guide on why your neck gets tight during ab workouts is worth a read alongside this one.