Did you know that being skinny means you can’t use the normal way of measuring your body fat percentage?
Or that being just a little bit too skinny-fat might sabotage your ability to build muscle leanly?
Or that most body fat percentage charts are ruined by a fatal flaw?
In this article we cover why your body fat percentage matters even as an ectomorph, how to measure it properly, and then we’ll run through some real-life examples (with pictures) so that you’ll know exactly what to do next.
But first, let me show you just how ridiculous this can be for skinny guys.
Let’s take a totally average guy in this study. He goes to get a DEXA scan, and he’s told that he has a body fat percentage of 20%. Then he goes to sit in the BodPod, which puts him at 22%. A bit of a discrepancy, but he can be reasonably confident that he’s between 20–22%. Moreover, both of those body fat percentages have the same implication for his health and appearance: he’s a decently healthy guy who looks a bit out of shape.
The overweight guy goes in next. DEXA puts him at 34%. BodPod puts him at 32%. Now it’s DEXA that’s estimating high, but the discrepancy is still just 2%. Again, not a big difference at all. He’s overweight either way.
Now you walk in. DEXA puts you at 9%. Amazing! Not only are you lean enough to bulk aggressively, but you’re also leaner than most professional athletes. Next, you get your BodPod done. They tell you that you’re 16% body fat…
Huh? 16% is a high enough body fat percentage that you shouldn’t even be bulking at all yet. You should be cutting.
You’ve spent a few hundred dollars and an entire day getting two of the most accurate body fat percentage tests in the world, and you can’t even tell if you should start bulking or not. For guys who are underweight, DEXA and BodPod can be off by up to 13%. Totally useless.
So what should you do?
…and wait a second—why shouldn’t you bulk if you’re 16% body fat?
Why 15% body fat marks a turning point
When you’re under 10% body fat, your deflated fat cells are hungry. It’s very hard to bulk leanly, and if you focus on trying to stay at a very low body fat percentage, you’re going to build muscle very slowly. If you’re lucky, you’ll gain a pound every month, and even then, only half of it will be muscle. This gets more and more extreme as your body fat percentage gets lower, so building muscle at 9% is a lot easier than building muscle at 5%.
For example, when a bodybuilder steps off stage and gets back to eating a regular amount, he’ll often gain 10–20 pounds of pure fat. His body needs fat far more than it needs muscle at this point. Then when he gets closer to 10% body fat, he can start bulking properly again.
Also keep in mind that if you cut down to under 10%, it tends to make your face look worse. Muscles look good when you’re lean, but you don’t have many muscles on your face, so at a low body fat percentage your face starts to look bony.
When you’re over 15% body fat, your inflated muscle cells start to interfere with your overall insulin sensitivity. Even with a great weightlifting routine, you won’t be able to get your muscle fibres quite as insulin sensitive. And even a good muscle-building diet won’t be able to spark quite as much muscle-protein synthesis. This gets worse and worse as your body fat percentage gets higher and higher, so bulking at 17% is a lot easier than bulking at 30%.
This is why so many skinny-fat guys are unable to bulk leanly. When they gain weight, it seems to be mostly fat. So they cut away the fat until they’re back down to 20%, and then they try bulking up again, and again they just get fatter. So they give up, thinking that their genetics suck.
Their genetics don’t suck, they’re just not lean enough to bulk properly. They should be reducing their body fat percentage a little bit before trying to bulk up. Here’s how that works: what to do if you’re tired of being skinny-fat.
Note: being over 15% body fat doesn’t mean you’re fat. The average healthy guy has 20% body fat. It just so happens that when you’re trying to build muscle, it’s better to be on the leaner side of healthy.
When you’re in that golden zone of 10–15% body fat, your fat cells are satiated enough that your insulin sensitivity drops. But they aren’t so full that they start messing with your hormones, either. They’re neutral. So when you start following a good weightlifting program, the insulin sensitivity in your muscle cells will skyrocket. Feed yourself a good muscle-building diet and your muscles fibres will grow, your fat cells will not.
For example, here’s Taylor gaining 20 pounds while staying between 10–15% body fat.
He’s gaining over a pound per week but he’s hardly gaining any fat. And he’s just doing three workouts per week, each lasting about an hour. No crazy supplements or anything wild, just a solid science-based approach to building muscle.
This is why it’s so important to be able to guesstimate your body fat percentage. It doesn’t matter if you’re a few points off, but you need to know whether your body fat percentage is in the cutting or the bulking range.
Getting under 15% body fat is important visually as well. That’s when you start to look like you’re in good shape. It’s not enough to impress other men, but it’s when you start to look optimally attractive to women.
Some women do prefer chiseled abs, but the research pretty clearly shows that guys are about 99% of the way to optimal attractiveness by the time they get down to 15% body fat. This will not only give you good muscle definition, it will also make your face look lean and healthy.
If you’re over 15%, the quickest way to make yourself more attractive is to trim off a few body fat percentage points. This is true even for skinny guys. If you haven’t built much muscle yet, a good muscle-building program combined with a good cutting diet should allow you to gain a few pounds of muscle even while you lose fat.
Then when you get down to 10–15%, the best way to become more attractive is to focus on building muscle—on bulking up. And since your muscle cells will be more insulin sensitive, you’ll be able to build muscle more leanly (examples coming).
This is all to say that you need a fairly precise way to determine whether you’re under 15% body fat or not.
How to figure out your body fat percentage
We’ve already covered why DEXA scans and BodPods won’t work properly until you’ve already bulked up to a solid weight.
What about bioelectrical impedance analysis (BIA) scales? They’re cheap and convenient—most modern bathroom scales have this feature—but they’re even less accurate than DEXA and BodPod. Again, they’re just not something designed for guys like us. They’re for tracking fat loss in overweight people, not muscle gain in skinny guys.
To give you an example of how bad BIA scales can be, when I was bulking up from 130 to 170 pounds, it told me that my body fat percentage had climbed from 10% up to 20%. This made me sad, but I tried my best to ignore it because my abs looked the same as they always did.
Then something strange happened when I made it up to 185 pounds. It determined that I had an “athletic” body composition, so it switched to using a different algorithm. Instead of 20% body fat, it started saying I was 8.5% body fat.
The Navy’s measuring tape method? Again, this way of measuring body fat percentage used to determine whether a guy is overweight or not. Plus, it reads muscle gain the same as it reads fat gain. Bigger ab and lower back muscles will increase your waist measurement, after all.
How about skin fold calipers? Skin fold calipers require a decent amount of training to use properly. Otherwise, they don’t measure body fat percentage well enough to be that helpful. Still, they’re affordable, you can use them from the comfort of your own home, and they can work well if you can learn to have a skillful hand. Not bad at all, and the best method so far.
That brings us to:
The mirror method. Assuming you already have a mirror, this method is free. It’s also easy. And so long as you’re between 9–15% body fat, it’s actually quite accurate. Unlike the other methods, this is a method that works better the more muscle definition you have. So it works well when you’re thin, and then even better as you gain muscle.
Moreover, if you’re over 15% body fat, you know you should be cutting anyway. So even when the mirror is inaccurate, it’s still accurate enough to tell you that you should be cutting.
Now, you might be thinking, if you’re cutting, won’t you want to track your body fat percentage to make sure that it’s going down? Actually, no. There are better ways to track your cutting progress.
After all, you should always be following a good weightlifting program while cutting. Obese guys will lose mostly fat when they lose weight, but us naturally skinny guys / ectomorphs are more prone to losing muscle. Since we don’t have any muscle to spare, lifting weights while losing weight is mandatory.
So, since we’re lifting weights anyway, you can just make sure that you aren’t getting weaker. If you’re maintaining or gaining strength, you aren’t losing muscle.
To track how much fat you’re losing, you should weigh yourself each week while cutting. If you aren’t losing 1–2 pounds each week, you need to adjust your calorie deficit. This is how you ensure that you’re steadily losing fat.
So all you need to do while cutting is monitor your strength in the gym, monitor your weight on the scale, and then check how you’re looking in the mirror.
This means that even while cutting, the mirror works pretty well as your primary way of tracking your body fat percentage.
…But in order to use the mirror, you need to know what you look like at different body fat percentages.
In theory, that’s easy enough. You can just look up a photo of people at various body fat percentages. Problem is, most of those comparisons are useless for us ectomorphs.
Here’s a good example of a chart that doesn’t help us:
This Nerd Fitness chart is actually a whole lot better than most, but I chose it because I like Nerd Fitness, and because Steve Kamb makes this same point in his article Everything You Need to Know About Body Fat Percentage: muscle mass has a huge impact on how lean you look.
I couldn’t agree with him more.
Let me show you why.
Here’s GK’s progress over the course of The Bony to Beastly Program. He managed to stay at around 10% body fat the entire way through, but you can see that he started the program with almost no muscle definition, and finished the program looking totally chiseled. This has nothing to do with fat, everything to do with muscle.
So when you get a chart with random variance in muscle mass, it’s impossible to compare body fat percentage. We can see someone’s muscle definition changing, yes, but we have no way to tell whether that’s due to varying degrees of muscle mass or body fat.
There are other problems with this type of chart:
- The guys have varying tans. How dark your skin is has a huge impact on how lean you look. That’s why the bodybuilder has such an exaggerated spray tan.
- Some guys are oiled up. Again, this is a trick used to make guys look leaner.
- Some guys pumped up their muscles for the photo. Another trick used to bring out vascularity and muscle definition, making guys look leaner.
- They’re different guys. One guy might have proportionally bigger ab muscles, another might have different body fat storage patterns, some will have different amounts of visceral versus subcutaneous fat.
Moreover, the lighting isn’t the same. For an example of why that matters so much, take a look at Omar’s progress pictures. Like GK, he’s at roughly 10% body fat before and after bulking up.
On the left, he’s at the beach and there’s a lot of ambient lighting. He has abs, but you can only just barely see them. On the right, you can see that he’s gained a ton of size in his chest, traps, shoulders and arms, but is he also leaner? It’s impossible to tell because the lighting is so different.
Generally, overhead lighting will make you look more muscular than ambient lighting. This is why you probably look leaner in your bathroom mirror than you do on the beach (depending on the weather).
It’s even harder for us ectomorphs because so few examples show us skinny guys at varying body fat percentages.
So we’ve got two charts:
- An ectomorph who hasn’t bulked up yet.
- An ectomorph who’s successfully built a good amount of muscle mass.
And we’ve used illustrations so that we can keep all the variables constant except for body fat.
Here’s how you use the body fat percentage charts:
1) Find a mirror
2) Turn on some flattering overhead lighting (bathrooms work well)
3) Flex your abs and your butt (to rotate your hips into a decent position)
4) Compare your abs and muscle definition to these charts
Here’s what 9–20% body fat looks like on the typical skinny guy:
Here’s what 9–20% body fat looks like on a skinny guy after he’s bulked up:
Real-life body fat percentage examples
Here’s me at 11% as measured by DEXA scan and 10% as measured by BodPod. Note that I’ve bulked up to a bodyweight of 185 here (BMI of 24) so I’m heavy enough for these methods to be fairly accurate.
Here’s what that looks like in video, and with less flattering lighting. As you can see, I look the most like the 12% illustration shown above.
If you want to see what that ideal 10–15% range looks like, here are some examples. I’ll also give some examples of guys bulking at slightly under 10%, or slightly over 15%. In each case, the guy is at a great example of someone who has a perfect body fat percentage for bulking up fairly aggressively.
I’ll give my guesses for what their body fat percentages are both before and after, but keep in mind that the big distinction we’re trying to make is whether they’re lean enough to be bulking.
Here’s a great example of bulking at a very lean body fat percentage. EddiB isn’t even halfway through the program yet, and he’s still going strong, but so far it looks like his body fat percentage is ever-so-slowly climbing up from around 7% as he goes.
What’s great about this is that even if he gains a few more pounds of fat as he continues bulking, he should be able to finish his bulk at an ideally lean body fat percentage.
Here’s a good example of starting at a very lean body fat percentage. JonKyp went from something like 7% up to what looks more like 10%. This is a good example of faces looking great at around 10% body fat.
Here’s Nick starting at what must be around 8% body fat. He’s quite lean after gaining 27 pounds, but I’d guess he’s climbed up to around 11% by the end.
Here’s Albert starting and finishing at around 10%. You can see that his muscle definition goes way up as he bulks, even though he probably gained something like 2.5 pounds of fat to maintain his body fat percentage at 10%.
Lucas gained a bunch of muscle definition as he bulked up, but he’s probably at around 12% both before and after. He’s still at the lower end of the range, so he could just keep right on bulking without any issue.
Here’s Ash gaining a couple percentage points as he bulks, but winding up looking better for it. Looks like around 10% to start, more like 13% at the end.
I’m guessing Patrick was around 11% starting out and around 15% at the end of his 40-pound bulk. At this point, he might want to cut off a few pounds before bulking up more, but he wouldn’t have to—he’s still just barely lean enough at the end.
Here’s JoeBrusk, who started with way more muscle. He was probably at around 15% at the beginning (which is lean enough to look optimally attractive to women), but after some body recomposition, he finished at around 10% (which is lean enough to look impressively badass to other dudes).
John L started out with a good amount of muscle, and at around 14%, I’d guess. He finished at around 15%, I’d say, given that his muscles have about the same amount of definition despite being quite a big larger.
Here’s Hugo starting and around 11% and finishing at around 14%. What’s cool about this one is that he’s gained such an incredible amount of muscle that he’s got way better muscle definition despite being a few body fat percentage points higher.
Here’s a good example of bulking up at the upper limit of that ideal bulking range. I’m thinking Josua is flirting with 16–17%. This has him starting off with little definition, but finishing looking like some sort of professional football player.
I normally use my 130–185lbs bulking transformation, but here’s me at 200lbs cutting down to 180lbs. I started the cut at around 20% body fat and finished at around 10%.
Klaus is a good example of someone who came in at around 20% body fat. He was able to transform his physique by alternating between cutting and bulking, finishing 22 pounds heavier at around 9–10% body fat. What’s so amazing about this is how radically his overall body shape has changed. He’s got a pronounced v-taper by the end of it.
So what now?
If you’re under 15% body fat, the best way to improve your physique is to bulk up, and the good news is that you should be able to build muscle quite quickly. A beginner can gain 1–2 pounds per week, eventually slowing down to gain around 0.5–1 pound per week. You can expect to gain at least 20 pounds in 3–5 months.
If you’re over 15% body fat, the best way to improve your physique is to cut. If you’re still fairly skinny, you should be able to build a decent amount of muscle even while losing weight overall. Over the course of the next 3 months you could expect to lose 20 pounds of fat while gaining a few pounds of muscle. That will already have a dramatic impact on your physique, and then when you transition to bulking, you should be able to gain around a pound of muscle per week. If you started at 20% body fat, after 8 months (3 months cutting + 5 months bulking) you could expect to be at around 12% body fat with around 20 extra pounds of muscle on your frame.
Figuring out your body fat percentage is fairly simple, but staying lean while bulking requires a great system, as does cutting. If you want more guidance on how to do that properly, we can walk you through everything with The Bony to Beastly program.