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Illustration of a bodybuilder doing hypertrophy training to gain muscle mass.

The Hypertrophy Training Guide: How to Lift for Muscle Size

Hypertrophy training is designed specifically for stimulating muscle growth. It’s by far the best style of training for building muscle. Bodybuilders use it to build more aesthetic physiques. Powerlifters use it to build bigger muscles with greater strength potential. When Marco was coaching professional and Olympic athletes, he’d use it to help them gain functional muscle mass.

Hypertrophy training can’t be bent into the shape of any muscle-building goal. You can use it to get bigger, look better, gain strength, improve your athletic performance, or improve your health.

In this guide, we’ll teach you the main principles of building muscle, then how to min-max every variable of your workout routine, including how often to work out, which exercises to focus on, how many reps and sets to do, how hard to train, and how long to rest. By the end, you’ll know exactly how to train for muscle growth.

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Illustration of a bodybuilder doing lying dumbbell biceps curls.

How to Do Lying Dumbbell Biceps Curls

The lying biceps curl is a variation of the dumbbell curl. The difference is that it works your biceps through a deeper range of motion, challenging your biceps under a greater stretch, thus stimulating more muscle growth.

I’ll teach you how to do them, then explain why they’re so powerful. The research is fascinating. And just wait until you try them. You’ll feel the difference right away.

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Illustration of a bodybuilder doing a 4-day workout split routine to gain muscle mass.

The Best 4-Day Workout Splits for Building Muscle

4-day workout splits are my favourite for intermediate lifters. 3-day splits are almost always better for beginners, but once you get to an intermediate level, adding a fourth day makes your workouts easier and stimulates more muscle growth.

When Marco was coaching professional and Olympic athletes, he would put them on 4-day splits during their offseason to help them bulk up. These people had the highest-performing bodies in the world, and they would lift 4 days per week.

You’ve got a few options. You could do a bodybuilder’s “Bro Split,” an athlete’s Upper/Lower Split, or you could try a slightly more unusual approach I’ve been using for the past 4 years with clients.

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Illustration of a lifter doing a 5-day workout split to build more muscle.

The Best 5-Day Workout Splits for Building Muscle

5-day workout splits can be incredibly good for building muscle if you program them properly. When you’re training this often, it’s easy to beat up your hands, tire out your back, or accumulate nagging aches. Fortunately, there are simple methods for avoiding all those problems, which we’ll delve into in a moment.

My two favourite 5-day workout splits are the Bro Split and the Outlift Split. Both are similarly good for building muscle, but I have a soft spot for the Outlift split. We’ll break down both splits in detail.

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Illustration of a bodybuilder doing dips to build bigger chest muscles.

What Muscles Do Dips Work?

Dips are an underrated exercise, and there’s some fascinating research to cover. They’re one of the best exercises for building muscle in your chest and shoulders—arguably even better than push-ups and bench presses.

I’ve been doing dips for over a decade, and I credit them for helping me build a big chest. They also helped me bench 315 pounds, even though I rarely do the bench press.

So, what muscles do dips work? Why are they so powerful?

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Illustration of a man doing Blood Flow Restriction training (BFR) to build bigger biceps.

How to Do Blood Flow Restriction Training (BFR)

Blood Flow Restriction (BFR) Training is a Japanese muscle-building technique that occasionally makes its way into the mainstream. Peter Attia recommends it. NBA and NFL players use it. And you’ll see top bodybuilders and powerlifters swearing by it, too. I’ve been doing it on and off for over a decade, and it’s helped me add over two inches to my arms.

Restricting blood flow sounds strange and dangerous, but it helps you stimulate muscle growth with much lighter weights, making it one of the safer ways to stimulate muscle growth. It also seems to be quite good for our blood vessels. In fact, outside of athletes and bodybuilders, it’s most commonly used in rehab and with older lifters.

The research is promising, too, with the latest meta-analysis showing it can help with muscle and strength gains, at least under some circumstances.

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Illustration of a muscular bodybuilder climbing through the mythical anabolic window.

The Anabolic Window: Both Fact & Fiction

The “anabolic window” is an old bodybuilding term. A few years ago, it was pilloried by the evidence-based fitness community, and perhaps rightfully so—the requirements were woefully strict.

As so often happens, the backlash was overly harsh. There’s some merit to the idea of the anabolic window. The truth is that most people can benefit from taking advantage of it. That’s even more true for naturally thinner people.

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And illustration of a beginner going rucking to improve his cardiovascular fitness.

How to Ruck—The Complete Beginner Guide

Rucking is perhaps the safest, most effective, and most efficient way to improve your cardiorespiratory fitness (study, study, study). It can be two or three times as efficient as brisk walking (study). It’s one of the most effective forms of exercise for burning fat (study). It’s about as effective as jogging, but it’s much easier to learn and has a much lower risk of injury.

Rucking is walking with a loaded backpack, also known as a “rucksack,” hence the term “rucking.” The term comes from military training, but its origins go back far further. We’ve been carrying heavy loads over long distances throughout all of human history.

Hunter-gatherers carried spears and shields and baskets full of forage. Men would lug large game home after successful hunts. Women would carry their young children strapped to their backs. We’ve always been rucking, just without the rucksacks.

You already know how to ruck, but there are some guidelines that help.

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Illustration of a skinny guy who's worried about diabetes and insulin resistance while bulking up.

Can Bulking Cause Insulin Resistance & Diabetes?

Whenever we talk about how carbohydrates can be good for building muscle, we get comments from people worried that if they eat too many carbs, they’ll produce too much insulin, and their bodies will become desensitized to it, causing insulin resistance and potentially even leading to diabetes. Can that happen?

The other concern is that bulking means eating in a calorie surplus to gain weight intentionally. Can that calorie surplus cause insulin resistance?

I reached out to Dr. Karl Nadolsky, an endocrinologist who specializes in diseases like diabetes, and Danny Lennon, a nutritionist on the Advisory Board of the Sports Nutrition Association. I asked them if skinny and skinny-fat people should worry about eating too many carbs while bulking. Could that lead to insulin resistance and diabetes?

Their answers surprised me.

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