Why do some skinny guys with a low body-fat percentage not have visible abs? After all, for the average guy, getting abs simply requires getting lean. But what if you’re already lean and you still don’t have abs?
If you try to search for information about how to get abs, there are two types of advice that you’ll probably come across, neither of which apply to skinny guys:
- Abs are built in the kitchen, not the gym. Yes, most men get abs by dieting down to a lower body-fat percentage. That’s because most men are overweight, and most overweight men already have large ab muscles. After all, when someone gains weight, at least 33% of that weight is going to be muscle. Plus, the heavier someone is, the bigger their ab muscles will need to grow in order to support that extra weight. Overweight guys already have big abs. Skinny guys do not.
- Abs are built with high-rep ab routines—crunches, sit-ups, and so on. The most popular ab routines are high-rep circuits that are brutally painful, but aren’t effective at stimulating muscle growth. Doing high rep crunches to build bigger abs is like running a marathon to build bigger legs. High-rep circuits are designed for improving endurance and blood flow, not for gaining muscle size. Yes, you’ll see guys with great abs doing these routines. However, that’s not how they built their abs, it’s just something they do because they like their abs.
Neither of these pieces of advice work for skinny guys. After all, our problem is that our abs are too small. We need to build bigger ab muscles. We need a bulking routine for our abs.
So, what’s the best way for skinny guys to get abs?
Let’s start with an example. In GK’s before photo, he’s more than lean enough to have abs, they just aren’t big enough to be visible. Although I suppose you could say that his abs were built by eating everything in the kitchen, it’s probably more accurate to say that they were built in the gym.
We’ll start by going over your ab anatomy, and then we’ll talk about how to train your abs for muscle size.
Before we talk about 6-pack abs (rectus abdominis), let’s quickly talk about the muscles that are underneath those abs—the transverse abdominis muscles.
Your transverse abdominis muscles work sort of like a lifting belt or a corset, keeping your core stable as you move and lift. When you brace your core, these are the muscles that you’re flexing, and as you can imagine, they’re incredibly important for lifting heavy weights. After all, you can’t even do a bicep curl if your core has the consistency of an overcooked noodle. As a skinny guy, these muscles are even more important. Your core is thinner, and your spine needs all of the support you can give it.
However, these abs are deep muscles. You can’t see them. This is important because these are the ab muscles that are trained with squats, deadlifts, and most other compound lifts. These compound lifts will make your abs bigger, yes, but we’re talking about the deeper abs that are hidden underneath your 6-pack abs. If you’re trying to bulk up your abs so that you can see them, this won’t help.
When most people say abs, they’re usually talking about the rectus abdominis, which are situated on top of your transverse abdominis. Your rectus abdominis is made up of a series of muscle bellies and tendons. The bits that bulge out are the bellies, the canyons between those bulges are the tendons. This gives your abs their unique washboard shape:
These ab muscles can flex, just like any muscle can, allowing us to move our core like an accordion. Our 6-pack abs allow us to crunch forwards, and our obliques allow us to twist around. These muscles can also help us resist movement, keeping our ribs and hips in place when doing compound movements. They aren’t very active during squats and deadlifts, but they do help keep our core stable during push-ups and chin-ups.
If your bulking routine has lots of push-ups and chin-ups, you might do a good job of stimulating your ab muscles. However, if you’re a naturally skinny guy and you’re trying to build bigger abs, that probably won’t be enough.
As a skinny guy with a slenderer torso and less muscle mass, you’ll probably want to directly target your abs. That’s going to make your abs look better, and it’s also going to give your core more stability, improving your posture and allowing you to lift more safely.
As you build bigger abs, you’ll soon notice that they have their own distinct shape. You can make your ab muscles bigger with good training, but you can’t do anything to affect their symmetry or to alter the number of tendons that you have. Some have an 8-pack, other have a 6-pack. Some have a wide-pack, others have a thin-pack.
However, in a controversial new study, research has proven what belly-dancers have known for thousands of years: with enough coordination, your upper and lower abs can be individually targeted (study).
Most guys can’t see their lower abs. So after learning this, most guys will assume they have smaller lower abs, and they’ll start looking for exercises that target their lower abs, such as reverse crunches.
Although it’s possible that your lower ab muscles are disproportionately small, keep in mind that men store more body fat on their lower stomach than their upper stomach. Lower abs tend to be murky unless you are very lean—under 10% body fat.
Another reason you can’t see your lower abs might be because you don’t have any lower abs. If you take a look at Arnold Schwarzenegger, for example, you can see that underneath his belly button, he doesn’t have any tendons running across his abs. No matter how big Schwarzenegger builds his lower abs, he’d still never have any ab definition on his lower stomach. He simply doesn’t have lower abs.
The good news is that it doesn’t really matter. If your abs are strong and lean, it doesn’t really matter whether they’re symmetrical or not, or whether you have great lower ab genetics. If you have big ab muscles that are well defined, they’ll look awesome. Arnold Schwarzenegger is proof of that, of course, having built one of the most famous physiques of all time despite having no lower abs whatsoever.
Every set of abs will look different. All will look good.
How lean do you need to be to have abs?
Not all skinny guys have a low body-fat percentage. Many do, but it’s fairly common for skinny guys to be between 15–20% body fat, which is characterized by a softer stomach. If you aren’t lean, building up bigger ab muscles will just push the fat out further:
For a flat stomach, you’ll want to be at around 15% body fat. That’s enough to make you attractive to most women, but it’s not enough to have clear abs. To have clear abs you’ll usually need to be under 12%. If you’re curious about how lean you are, here’s how to visually estimate your body-fat percentage by looking at your stomach.
But if you want to see how lean you need to be to have abs, here’s me at 10.8% body fat. You can see that my abs are just barely coming in. If I were just a couple body-fat percentage points higher, they’d be completely covered:
As you can see, my ab muscles are quite small, even though I’ve got a fair bit of muscle overall. This is because I gained 55 pounds of muscle without any direct ab training. The most stimulation my abs got was from push-ups and chin-ups. So because I never directly trained my abs, they never grew much bigger as I bulked up.
Anyway, let’s say you’re closer to 20% body fat. That’s not an overly high body-fat percentage. That’s still within the healthy range. However, your abs will be completely covered. At that point, regardless of whether your ab muscles are big or not, your best bet is to cut.
As you lose fat, you can carve out your abs. They might not be big yet, but once they’re hard, you’ve got something to work with:
While cutting down to a lower body-fat percentage, you’ll want to be following a good lifting program. If you’re already somewhat muscular (as I was) you can expect to maintain your muscle mass and strength. But if you’ve only just started working out, you should be able to build some muscle while losing fat.
(We’ve got a free guide here on what to do if you’re skinny-fat.)
This means that whether you’re lean enough for abs or not, you need to be lifting.
So whether you’re under 15% or not, if you eventually want abs, you should be training them in the gym.
How Can a Skinny Guy Build Bigger Abs?
We’re going to teach you the best exercises for building up bigger ab muscles, but keep in mind that we need to get your hips positioned properly in order to get your ab muscles firing properly.
That way your abs won’t be hanging loose as you stroll around town, your gut won’t be jutting out even though you’re at 9% body fat, and eating a big meal won’t make you look quite as pregnant.
If you want to see what this looks like in real life, check this out:
This should also help fix the “lazy stomach” that some guys get when they aren’t intentionally flexing their ab muscles. Some degree of this is okay, but it’s best if your abs have the strength, positioning and endurance to always have a little bit of tension in them.
Here are two pictures that one of our members took just seconds apart. In the left photo, even with a low body-fat percentage, his ab positioning is preventing him from having abs. When your stomach is stretched like that it prevents the abdominal muscles from contracting properly, which can ruin a skinny guy’s ab definition:
Fortunately, stronger ab muscles are better at holding your hips and ribs together. This means that building up bigger abs will improve your posture, and improving your posture will help you build up bigger abs. These goals work additively with one another. By focusing on both simultaneously you’ll get the quickest (and best) results.
The Best Exercises for Bulking Up Your Abs
There are a few ab exercises that are particularly effective for getting your hips into a proper position and building up bigger, stronger ab muscles. Here are six different exercises that will bulk up your abs in different ways, improve your posture, and help you bulk up the rest of your body as you do it.
The plank: The plank is great for teaching your abs how to become comfortable maintaining good posture under load. It’s an isometric exercise, meaning that you’re stimulating your ab muscles by resisting movement.
The farmer carry: In this exercise we’re teaching your abs how to maintain a plank position while walking around with heavy things. This isn’t really an exercise for your abs, per se, but it’s great for your obliques, which are just as important for improving the appearance (and function) of your core.
The Sit-Up: Crunches involve repeatedly bending your spine under load, and while that isn’t always harmful, the most respected spinal health expert in the world, Dr. Stuart McGill, advises against them. Instead, he recommends variations where the spine remains in a more neutral position. These spine-conscious variations will also ingrain better lifting habits, as you’ll learn how to keep your abs on lockdown during compound lifts. This makes them a better ab exercise for a skinny guy who’s trying to build up bigger muscles overall.
Dumbbell Pullovers: In this ab exercise, you’re moving in the shoulder joint while your abs fight to keep your ribs down. The bigger and stronger your back and chest get, the bigger and stronger your abs will become.
Goblet Squat. In this exercise you’re moving in the hips while your entire core is lit up. The bigger and stronger your entire body becomes, the bigger and stronger your core will become. Again, it’s not specifically an ab exercise, but it’s fantastic for your obliques and spinal erectors, which will make your core look quite a bit better (and much stronger).
Reverse Crunches: The reverse crunch works your abs through a fairly large range of motion, making it great for bulking your ab muscles up. What makes it even better is that it trains the lower abs a little harder than the upper abs, which balances out the other exercises, which focus mainly on the upper abs. This ab exercise is also good for your posture, which is an important part of having visible abs.
If you make a habit of doing one or two of these exercises every workout, your abs will grow quickly. When they become easy, just switch to more difficult variations, such as hanging leg raises and ab-wheel roll-outs.
How to Bulk Up Skinny Abs: Summary
As a skinny guy, building bigger ab muscles will come down to three things:
- Train your abs just like any other muscle group. Train them heavy enough and often enough to stimulate muscle growth.
- Cut down to under 12% body fat if you want good ab definition.
- Strengthen your posture so that your abs will activate and flex naturally
Also remember that you don’t need abs. You’re perfectly healthy at 18% body fat and perfectly attractive to women at 15% body fat. Abs are a bonus. No need to stress out if you lose sight of your lower abs when bulking, or if you’re a skinny-fat guy and want to focus on building up muscle before you worry about chiseling out your abs.
And as always, if you want help bulking up, check out the Bony to Beastly Bulking Program.