Illustration of a skinny beginner working out to build muscle.

The Muscle-Building Workout Plan for Skinny Beginners

Most skinny guys are eager to build muscle fast. I don’t blame them. I was the same way. When I weighed 130 pounds, with a BMI under 17, I was sick of being skinny. I wanted to get out of that situation as quickly as possible.

The best way to build muscle is to lift weights. Most of us know that. But I had just graduated from university with a degree in graphic design, I’d never been active, and I didn’t know a single person who lifted weights. Well, I knew one person who shoplifted, but I didn’t want any part of that. And when you’re that far outside of a subculture, it can be hard to know where to start or what to do.

Since then, I’ve gained 70 pounds, going from a 65-pound bench press to a 315-pound bench press. My business partner, Marco, has helped college, professional, and Olympic athletes bulk up. Together, we’ve spent over a decade helping millions of readers and over 10,000 skinny clients build muscle (naturally).

Fortunately, once skinny guys start following a good workout plan and eating a proper bulking diet, we can gain muscle faster than any other body type. Our frames are empty and eager for muscle growth. Most of us are able to gain 25 pounds within our first 6 months of working out. Some of our clients have gained 40.

In this article, I’ll walk you through the process of training for muscle growth. By the end, you’ll know exactly what to do.

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Illustration showing a skinny ectomorph having trouble with the barbell bench press.

Ectomorph Workout Plan: Beginner Weight Training Routine

Skinny guys are often called “ectomorphs.” It’s a slang term referring to our thinner bones, narrower frames, shallower ribcages, or lankier limbs. Does being naturally thinner affect how we should exercise, lift weights, and build muscle?

Many of us ectomorphs also have atypical goals. Most people want to lose weight, we want to gain it. Most people intuitively eat too much food, we eat too little. We’re usually eager to bulk up, and we often have a hard time of it. Some may even worry they’ve got bad muscle-building genetics. Does that change how we should train?

Different workout programs are designed for people with different goals. Some, like CrossFit, are designed to improve our general fitness. Others, like Starting Strength and StrongLifts 5×5, are designed to improve our general strength. Still others, such as bodybuilding, seem entirely centred around helping naturally muscular guys gain even more muscle. What’s the best way to work out if we’re trying to gain muscle size?

So, how should ectomorphs work out?

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The Best Exercises for Building Muscle

One of the most common questions we get asked is, “What exercise is best to grow my small chest (or arms, shoulders, abs, etc)?” It’s a surprisingly large question. Yes, some exercises tend to be better for activating certain muscle groups, but that’s just the tip of the iceberg:

  • Effectiveness: how well they build the target muscle groups
  • Efficiency: how many different muscles they bulk up at once
  • Learning curve: How easy they are to learn and master
  • Risk-to-reward ratio: How likely they are to strengthen versus injure us

So we’ve put together a guide showing you the best exercises for each muscle group. These exercises represent your best chance of safely building muscle as rapidly as possible for your experience level.

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