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Illustration of a skinny guy with a fast metabolism flexing his burning biceps.

Do Skinny People Have Faster Metabolisms? Yes, Sometimes

There’s a common myth in the fitness industry that skinny people don’t have faster metabolisms, they just don’t eat as much food. According to this line of thinking, there’s no such thing as a fast or slow metabolism. Rather, your metabolism is determined by your height, age, weight, lean mass, exercise habits, and activity levels. There are two problems with this line of thinking.

First, those variables can result in huge changes in metabolic rate. For example, in a study published by Science, they found that a 180-pound person could burn anywhere from 1,400 to 5,700 calories per day (study).

Second, even if you account for every single one of those variables, metabolisms can still vary greatly between people. Even when living totally average lifestyles, naturally skinny people often have unusually fast metabolisms.

Let’s go over the research and implications. Then we can talk about how to gain weight and build muscle with a fast metabolism.

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Illustration of a skinny guy building muscle by doing a clean bulk.

How to Clean Bulk: The Nutritious Way of Building Muscle

Clean bulking is when you approach bulking with a monk’s asceticism, eating only the purest foods and carefully avoiding culinary hedonism. It may sound like I’m poking fun. That’s true. But there’s also truth to be found in clean bulking. There are no shades of grey. No nuance. This is often presented as a negative, but it also makes the diet simpler to learn and easier to follow.

Clearer boundaries are easier to stay within. Instead of trying to limit your junk food, you avoid it entirely. Foods like pasta and bread are neither whole nor wholly processed. These are grey foods. They have no place in a clean diet. There’s a simplicity here. Eat this, not that. It works.

Perhaps most importantly, clean bulking diets are nutritious. They aren’t necessarily more nutritious than balanced bulking diets, but eating clean is certainly a healthy way of eating. If it works for you, there’s plenty of upside with very little downside.

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Calisthenics Vs Weights: Which Builds More Muscle?

Both calisthenics and weight training can stimulate muscle growth. That’s not answering your question, though. Resistance bands, bodybuilding, and powerlifting all stimulate muscle growth. So can cardio. So can flexing your muscles (study).

We’ve helped thousands of people bulk up over the past decade, some using weights, others with pure calisthenics. We’ve seen how their results compare. There’s also research comparing the results people get with calisthenics vs weight training. We can take that into consideration, too.

We don’t have a bias. We don’t sell weights or gymnastic rings. Our brand isn’t built on one approach or the other. We’ve trained both ways. We’re happy to use and recommend whatever gives the best results.

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Illustration of a skinny guy building muscle by dirty bulking.

What Is Dirty Bulking? Are the Results Worth It?

There are countless weapons lifters wield against the skeletal armies of atrophy. One such weapon is the “dirty bulk.” It disregards standard nutritional recommendations, using whatever means necessary to get into a calorie surplus. Usually, that means eating plenty of junk food.

We’ve dirty bulked in the past. We’ve had clients do it, too. Most were everyday people, but some were college, professional, and Olympic athletes. You’d be surprised at what they eat to get into calorie surpluses.

Dirty bulking can be good for building muscle. It won’t necessarily make you fat, either. Some dirty bulkers gain muscle more leanly than some clean bulkers. The Devil is in the details, and we’ll delve into all of those details.

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Illustration of a skinny guy flexing his arms to build muscle.

Does Flexing Build Muscle? Yes, But It’s Not What You Think

I came across this fascinating story about Charles Atlas years ago when I was writing an article about training for muscle size. If you don’t know, we’re a muscle-building site for skinny guys, and Charles Atlas was the first person to mass-market a workout program specifically designed to help skinny guys bulk up.

His story is much more interesting than I expected. First of all, it’s a flexing program. You buy the guide, and then you do a flexing routine at home. The “dynamic resistance” from flexing is supposed to stimulate muscle growth. There’s nothing wrong with that idea in theory, but does it actually work?

There have been studies measuring muscle growth from flexing, too. We can look at the results of a recent one.

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Illustration of a skinny lifter using collagen to build muscle.

Does Collagen Help Build Muscle? A Quick Research Overview

Collagen is a popular “anti-aging” supplement for maintaining skin elasticity, keeping our joints strong, and helping our connective tissues recover. So far, the research has shown that collagen does indeed offer all of those benefits, in a small way—probably (study, study).

Lifters often run into nagging aches and pains in their joints and tendons. Supplementing with collagen seems like a reasonable way to improve recovery. That raises an obvious question: what about muscle growth? Does collagen help build muscle?

Jacinto and colleagues tried to answer that question by comparing whey protein against collagen protein, then seeing which yielded more muscle growth. It’s a neat study. Let’s delve into it.

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Illustration of a bodybuilder doing cardio after lifting weights, but he's losing all his muscle mass.

Does Cardio Kill Muscle Gains?

Cardio can kill muscle gains. We’ve known this for many decades. It’s common knowledge among lifters and has been proven in peer-reviewed studies. Most recently, a study found that cardio cut muscle growth in half. We’ll go over the nuance of that study in a moment.

However, if you’re clever, you can use cardio to improve your muscle growth. This is fairly well-documented, too. We’ll go over some interesting research. I’ll also point out that in our twelve years of helping skinny guys bulk up, the guys who get the best results are the ones in good shape overall.

So, let’s talk about how to do cardio in a way that enhances instead of destroying your muscle gains.

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Illustration of a skinny guy who gained weight by eating more calories.

How Many Calories Do You Need to Gain Weight? (With Calculator)

You’ll often hear that the number of calories you need to gain weight depends on your age, sex, height, weight, activity level, and metabolic health. That works well if you’re overweight like everyone else. It works less well if you’re starting off thin and trying to become muscular, neither of which is typical.

If you’re trying to gain weight or build muscle, you can forget most of those factors. They’re for estimating how lean and muscular you are. If you lift weights, you can be lean and muscular at 20 or 50, so those proxies won’t do you much good. If you have a rough idea of your body-fat percentage, you can be much more accurate.

The other thing to consider is how fast you’re trying to gain weight. If you’re bulking leanly, you’ll need fewer calories. If you’re bulking more aggressively, you’ll need more.

So, I’ve made a simple calorie calculator that will ask you all these questions and spit out an estimate. Once you have that estimate, we can talk about what to do with it.

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Illustration of a barbarian bodybuilder lifting weights to maintain his muscle size and strength.

Maintenance Training Volume: How Many Sets to Maintain Muscle?

The other day, I wrote an article about Reverse Bulking, my favourite method for maintaining gains after bulking. The idea is to keep lifting weights, keep eating a good diet, and keep living a healthy lifestyle, but to start listening to your appetite again. Most naturally thin guys tend to eat less, lose weight, and reclaim any leanness lost while bulking—while maintaining their gains.

The idea of Reverse Bulking brings up a couple of questions. Perhaps the most important of those is how hard we should train to maintain our muscle size and strength. More specifically, how many hard sets do we need per muscle group?

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Illustration of a guy reverse bulking to lose fat while keeping his muscle gains.

Reverse Bulking: How to Maintain Your Gains After Bulking

Reverse bulking is for people who are sick of eating so much food but want to maintain the gains they made while bulking. I haven’t seen this discussed anywhere else, which is strange, given how well it works. I’ve been using this method on myself and clients for over a decade now, but we never named it, and I don’t think we’ve ever mentioned it our articles.

The idea is simple: most skinny guys hate eating enormous amounts of food. When they finish bulking, they want to go back to eating like regular human men again. But they’re worried that if they do, they’ll lose all their hard-won gains. That’s where reverse bulking comes in.

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