Different Types of Abs & What Affects Their Shape

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ACE certified personal trainer Monica Morris explains the anatomy behind 6-packs

Co-authored by Monica Morris and Dan Hickey

Last Updated: July 10, 2026 Fact Checked

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• 4 vs. 6 vs. 8-Pack
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• Asymmetrical Abs
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• Men vs. Women
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• V-Cut Abs
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• More Ab Appearance Factors
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• Core Anatomy
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• Training Abs
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• FAQs
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• Video

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If you look at enough people, you’ll notice that no two sets of abs look exactly the same. Your genetics play a big role in what type of abs you’ll have, and as it turns out, there are quite a few variations! We talked to personal trainers to help explain them all and what makes them different, from 4-, 6-, and 8-packs to symmetrical vs. asymmetrical abs to V-cuts and more. Plus, we’ve got tips from professional personal trainers on how to train your abs for better definition and visibility.

How do you get different types of abs?

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ACE certified personal trainer Monica Morris says your genetics and lifestyle determine the appearance of your abs. This includes whether you have 4-pack, 6-pack, or 8-pack abs and whether your abs are perfectly symmetrical or “staggered.”

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Section 1 of 8:

4-Pack vs. 6-Pack vs. 8-Pack Abs

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1. 
   Whether you have 4, 6, or 8 ab muscles in your “pack” is determined by your genetics. We’re all born with a rectus abdominis, a pair of long, flat muscles that run vertically up and down your stomach. These two muscles are divided down the middle by the linea alba, with fibrous bands (tendinous intersections) crossing horizontally to create muscle “packs.” The number of tendinous intersections you have determines what type of ab pack you have and is completely genetic.

   • Those with 4-pack abs have 2 intersections, while those with a 6-pack (the most common configuration) have 3. Having 4 intersections gives you an 8-pack, and so on.
   • “When you’re becoming really lean and working on your abs, it’s possible to get an 8-pack, with the two little packs at the top being just slightly pronounced,” agrees Morris.
   • It’s rare, but possible, to have 10-, 12-, or even 2-pack abs. It all depends on what you’re born with.
   • Busting a myth: Despite what a 6-pack makes it look like, there are no upper, middle, or lower abs—just your 2 abdominis muscles on either side. There is no way to target your upper or lower abs to show another set of muscle packs, since all ab exercises work the entire muscle.

   Meet the wikiHow Experts

   Monica Morris is an ACE certified personal trainer with over 15 years of instruction experience.

   Christopher Carreiro is a certified personal trainer and the founder of Aum Training Center in Boston with over a decade of experience.

   Laila Ajani is a fitness trainer and the founder of Push Personal Fitness in San Francisco with over 10 years of experience in personal training.

   Scott Yonehiro is a personal trainer with over 26 years of experience who has been sharing fitness content on YouTube since 2008.

   Errol Ismail is a certified personal trainer with nearly 10 years of experience and is the CEO and co-founder of Maestro Training.
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Section 2 of 8:

Symmetrical vs. Asymmetrical Abs

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1. 
   Visible muscle packs may be even or uneven, depending on your anatomy. Uneven or “staggered” abs occur when the tendons that divide your rectus abdominis into packs don’t 100% line up on either side of your abdomen. According to certified personal trainer Christopher Carreiro, whether your abs are perfectly symmetrical or not is “related to your actual anatomy, and there’s not much you can do about that. It’s just based upon your genetics.”

   • Asymmetrical or staggered abs are actually more common than perfectly even ones. Many athletes, bodybuilders, and fitness models have uneven abs to varying degrees.
   • Occasionally, sports that favor activity on one side (like golf) or medical conditions like scoliosis (which affects the curvature of the spine) may contribute to an uneven appearance.
   • Adding mobility work and single-sided (unilateral) training to your exercise routine may help reduce an uneven appearance (and make up for strength differences between the two sides of your abs). However, their overall uneven appearance will remain.

Section 3 of 8:

Men's vs. Women’s Abs

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1. 
   Women usually have a harder time achieving the same ab definition as men. Anatomically, men and women have the same abdominal muscle setup, and both genders are capable of getting a shredded 6-pack. However, women need to maintain a higher level of body fat to stay healthy compared to men (20-30% for women, and 12-20% for men). This means that even a very fit woman with a healthy body fat percentage may not have the same “chiseled” look that a similarly in-shape man could get.

   • Men also carry more muscle mass and may develop thicker abdominal muscles than women. Paired with a naturally lower body fat percentage, male abs seem to “pop” more than women’s.
   • Women can definitely get the same ab definition as men—they just have to train harder to lose the extra body fat to make their abs more visible.
   • Note that a sustained body fat percentage under 16% for women or 6% for men is considered unhealthy and may interfere with your basic metabolic and hormonal processes.
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Section 4 of 8:

What are V-cut abs?

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1. 
   “V-cut” abs are abs with a visible line where your obliques meet your core muscles. Morris says, “The V-cut refers to a separate cut that forms the shape of a V at the bottom of the abs, below the six pack.” This cut is typically only visible at a low body fat percentage (starting around 11% for men or 16% for women). Technically, anyone can get V-cut abs—it’s just a matter of lowering your body fat levels and training your core for definition.

   • Morris adds that if you have an 8-pack, you’ll typically also have a V-cut.
   • Getting V-cut abs is more challenging for some than for others. For example, women with a pear-shaped body or those who genetically hold onto more skin or body fat in their lower abdomen may struggle to get definition in this area.

Section 5 of 8:

More Factors That Impact Ab Appearance

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1. 
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   Body fat percentage Everyone has ab muscles—you just may not be able to see them depending on the rest of your anatomy! Generally, women below 19% body fat and men below 9% will have visible, defined abs. As your body fat percentage gets higher, this definition decreases until your abs are no longer visible beneath the skin.
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   Genetics Morris says that both genetics and lifestyle dramatically impact the appearance of your abs. “Let’s say you adhere to a perfectly clean diet, doing everything by the book. If your genetic makeup does not facilitate a six-pack, you may get more of a bulky look, where just obliques could possibly show. Or, similarly, just the V-cut at the base may show with a hollow-looking ab block.”
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   Aging As you get older, your muscle mass diminishes, your core gets weaker, your metabolism slows down, and your fat redistributes from under the skin to deeper inside your abdomen. All of these factors contribute to less defined, less visible, and weaker ab muscles.

   • However, everyone is different—if you have great genetics and stay active later in life, you may hold on to a toned abdomen for decades.
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   Type of training Of course, the type of workouts or sports you do might impact how your abs look too. For example, runners and cardio athletes may have flatter, toned abs that are visible because of a very low body fat percentage, while gymnasts and calisthenic athletes may have denser, more defined abs from the intense core stability they need to perform.

   • Morris adds, “The best way to create detail for a defined abdominal wall is to exhale during the more challenging part of a crunch. It doesn’t matter what crunch you’re doing—the slower and longer you exhale throughout the hard part, the more defined your abs will appear.”
   • For another example, golfers and tennis players who use powerful twisting motions may have more defined obliques than abs, giving them a slightly wider look.
   • Bodybuilders and power lifters who really put on muscle in their core may have visible abs at a higher body fat percentage than normal, leading to a big, full 6-pack look.
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Section 6 of 8:

Abdominal Muscle & Core Anatomy

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1. 
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   Rectus abdominis This is the large muscle group responsible for your 4-, 6-, or 8-pack. The rectus abdominis is a pair of muscles that run vertically along either side of your abdomen, from your ribs to your pelvis. It’s divided down the middle by the linea alba, a band of connective tissue that creates the “midline” of your abs.

   • Function: Holds your internal organs in place; stabilizes your body during movement; flexes your lumbar spine; assists with breathing; helps maintain posture.
   • Effective exercises: Crunches, sit-ups, hanging leg raises, planks
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   Pyramidalis This is a small, triangular muscle at the base of your pubic bone. It sits in front of the rectus abdominis and attaches to the linea alba. Around 20% of people don’t have this muscle.

   • Function: Maintain your posture and the internal pressure of your abdomen.
   • Effective exercises: Leg raises, pelvic tilts, flat-back ball squeeze
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   External obliques Your external obliques are on the sides of your rectus abdominis. They’re a large, flat pair of muscles that run from the sides of your body toward the middle. Your external obliques are the visible obliques and form the “side cut” or “V-cut” on very lean individuals.

   • Function: Controls twisting motions in your trunk.
   • Effective exercises: Side planks, oblique twists, bicycle crunches, woodchoppers
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   Internal obliques Your internal obliques sit under your external obliques on the sides of your abdominis rectus (just inside your hip bones). They’re thinner and smaller than the external obliques, but contribute to the thickness and shape of your waist.

   • Function: Assists your external obliques in twisting your trunk.
   • Effective exercises: Russian twists, side bends, cable rotations
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   Transversus abdominis The transversus abdominis is the innermost flat muscle group layered underneath your internal obliques. It extends from your abdomen around the sides of your body. This is the muscle bodybuilders use to hit the classic vacuum pose.

   • Function: Stabilizes your trunk; maintains your internal abdomen pressure; compresses the abdomen to protect internal organs and support your back; helps with breathing; reduces lower back pain.
   • Effective exercises: Planks, abdominal bracing, vacuum exercises
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Section 7 of 8:

Training for Visible Ab Definition

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1. 1
   Lower your body fat percentage through diet to make your abs more visible. “Training your abs till you die will not give you a six pack. What will give you a six pack is if you drop your body fat,” advises registered clinical exercise physiologist Eric Martinez. “It's about what you're eating more than anything else.”

   • “Reduce the fat intake in your foods, as well as refined sugars,” explains Morris. “The biggest offenders of developing detailed ab muscles are dairy and alcohol. By removing those from the diet, the likelihood of being able to see your abs increases greatly.”
   • Morris adds that the ab muscles will become pronounced if you maintain an “intense caloric deficit and abdominal wall development.”
   • Eat plenty of lean protein, whole-grain carbs and starches, healthy fats like olive oil and avocado, and plenty of vegetables and fruit.
   • Maintain a calorie deficit to help you lean down and reveal those washboard abs. A deficit of 250-500 calories per day is recommended for weight loss.
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   Train your abs at least two times a week. Fitness trainer Laila Ajani says, “You can see progress with 1 or 2 times per week, but you’ll probably see more progress with 5 or 6 times per week.” The type of ab exercises you do influences how often you train, though. If you’re doing low-intensity exercises like planks or deadbugs, it doesn’t hurt to train your abs almost daily.

   • However, if you’re doing high-intensity or weighted exercises like crunches or weighted sit-ups, give yourself one or more rest days between sessions for recovery.
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   Do a variety of ab exercises to build muscle mass and add definition. “Superior ab exercises include hanging knee raises, deadbugs, and cable weighted cable crunches,” says certified personal trainer Julian Arana, M.S.eD., NCSF-CPT. Other ab-shredding moves include lying floor leg raises, butterfly kicks, planks, and ab rollouts. (There’s more out there for your abs than just crunches!)

   • Adding weight to your ab exercises is great for muscle growth (hypertrophy), which will make your abs thicker and more pronounced (even at a higher body fat percentage, like some bodybuilders or powerlifters).
   • High-rep bodyweight moves and calisthenics are also beneficial for building core strength, stability, and better posture.
   • For weighted moves and muscle growth, do 3-4 sets of 8-12 reps (progressively increasing weight as you get stronger) per exercise. For body weight moves, do 10-20 reps.
4. 4
   Work your obliques to add more definition to your torso. Carreiro explains that “some things like doing a side plank, for example, can help to really strengthen your obliques and create more balance from side to side.” The added definition can also enhance the look of a 4-pack, adding more lines for a chiseled appearance. (This may be helpful for those who are self-conscious about “only” having a 4-pack instead of a 6-pack.)
5. 5
   Do whole-body compound exercises that indirectly work your core. Personal trainer Scott Yonehiro says, “Even if you're doing squats or you're doing dumbbells on your back, you're using your core, you're using your abs to protect your spine. Your transverse abdominis is activated.” Certified personal trainer Errol Ismail agrees and adds, “Anything that forces you to engage your core to stabilize will work your abs.”

   • Ismail recommends “squats with a weight extended straight out in front of you” for abs. “Another option is a one legged deadlift where your abdominals will have to engage to help you maintain your balance.”
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   Add some Pilates or yoga to your exercise routine. Pilates instructor Desiree Sanchez says that for great abs, “the most effective thing is to do Pilates mat work because it's all body weight work on the floor. You will 100% see a big change in your abs.” Pilates beginners are more likely to see fast results, although gains may plateau as you get more experienced.

   • “Going into any yoga pose will be tremendously beneficial for every layer of abdominal tissue and abdominal muscle,” adds certified yoga therapist Susana Jones, C-IAYT, starting with “the dynamics of the way in which you’re breathing.”
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Section 8 of 8:

Frequently Asked Questions

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1. 1
   What is the most common type of abs? A 6-pack is the most common type of abs. About 60% of people have a genetic 6-pack, making it the most common type of “pack.” About 20% of people have an 8-pack, while 15% have a 4-pack.

   • Only around 2% of people have the genetics for a 2-pack, and less than 1% can have a 10- or 12-pack.
   • In terms of symmetry, asymmetrical (staggered) abs are more common than perfectly symmetrical ones. Lots of celebrities, fitness models, and pro athletes have staggered abs.
2. 2
   Are your abs purely genetic? Yes, the type of abs you have (the number in your “pack” and whether they're staggered or symmetrical) is completely genetic, and you can’t train for even abs or a larger-number pack. However, you can do exercises for definition and cut down your body fat percentage for a more pronounced, aesthetic appearance.
3. 3
   Does training abs burn belly fat? No, exercising your abs does not burn fat specifically on your belly (or anywhere else). Fat loss happens all across your body and can’t be “targeted” to certain areas. A combination of diet, strength training, and cardio training is needed to lose fat anywhere on your body.
4. 4
   What are the benefits of a strong core? Your core includes your pelvis, lower back, hips, and stomach, and is primarily responsible for maintaining your balance and stability (steadiness). A strong core makes it easier to do athletic activities as well as everyday tasks like bending over or reaching for things up high. A well-developed core also prevents physical fatigue and injuries, and can contribute to your overall endurance.

   • Your core also maintains your intra-abdominal pressure (the pressure within your abdominal cavity) and protects your internal organs like a muscular brace.
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