Lean bulking for mesomorphs

Written by Martin Ebner
Last updated August 2026

Updated August 2026

Most people looking for a lean bulk are asking one thing. How do I get bigger without getting soft?

Mesomorph is the word that gets used for a body that responds quickly, and if that's you, the honest answer is smaller than you'd like. A couple of hundred calories a day more than you eat now, most of it from carbs, maintained for an extended period of time. Not a twelve week phase with a start and a finish. A dial you nudge, and then mostly forget about.

You may well have tried the other version. Eating everything in sight, multiple kilos added on the scale each month, and a few months later you're bigger but you don't much fancy what you see, so you pull the whole thing back down again. There's nothing wrong with you. That's what happens when the dial gets turned too far. Typically it gets turned too far fastest by the people whose bodies respond quickest.

I shift mine season to season. I'm leaning up at the moment, which is the same dial turned the other way. Small numbers, held for a long time. It's less exciting than it sounds but it's the one that leaves you bigger a year later instead of back where you started.

THE THREE DIALS‍

Eating well comes down to what you eat and how much of it. Most people who ask me about building muscle understand the what reasonably well. Chicken, rice, oats, eggs, fruit, vegetables. It's the how much that gets away from them.

I think about it as three dials. Protein, carbs, and fat.

PROTEIN STAYS CONSISTENT

Building or leaning up, protein barely moves. Two grams per kilo of bodyweight, consumed in twenty five to forty gram portions across the day instead of one enormous plate at nine at night. Lean sources do most of that work. Chicken, turkey, steak, fish, tofu, whey. People reach for nuts and beans thinking protein, but those contain mostly fat or carbs with a little protein.

CARBS DO THE MOVING

Carbs are the dial you turn to build, and the same one you turn back when you want to lean up. Rice, potatoes, oats, bread, fruit. If what you're chasing changes during the year, this is what changes with it.

FAT IS WHERE IT OFTEN GETS AWAY FROM YOU

Fat carries more than twice the calories of the other two for the same weight, so a modest looking amount is almost never modest. Olive oil, avocado and nuts are all worth eating but don't go over the top. Healthy doesn't mean unlimited. A surplus of good food is still a surplus.

HOW MUCH EXTRA?

Not much, which is the answer nobody wants.

A couple of hundred calories a day over what you're eating is typically enough. That's a large yogurt and a banana, or an extra half serving of rice. It isn't a feast and it shouldn't feel like one.

If you've never looked properly at what you eat, start there. Write it down for three to five days. Not to count forever, and not to judge it, just to see it. Almost everyone is surprised. You can't tune what you can't see.

Then put the scales away. Calorie counting is fine as an education exercise. It isn't a lifelong practice. Track long enough to learn what a hundred grams of rice looks like on a plate, and you'll estimate it accurately from memory for the rest of your life. People who count for years aren't healthier for it. They're usually just more anxious about food.

HOW YOU'LL KNOW IT'S WORKING

The bathroom scale gets a glance, not a stare. Once a week, same morning, same conditions, and you want to see it creep rather than climb. If it's jumped up two kilos in a fortnight, the dial's gone too far up.

The measurements worth more of your attention:

ARE THE WEIGHTS GOING UP?

This is the honest one. If you're adding reps, kilos, and sets month on month, you're building. If your workouts stagnate, more food won't start it moving. A surplus on top of training that isn't progressing gives you the fat and none of the muscle, because there's nothing for the extra food to build on. Sort the lifting first, then feed it.

HOW DO YOUR CLOTHES FIT?

Not the waistband on its own. Shoulders, chest, sleeves, collar, thighs.

A PHOTO IN THE SAME LIGHT, A COUPLE OF MONTHS APART.

You look at yourself every day, which is exactly why you can't see the change happening. A photo every now and again changes that.

WHAT A DAY OF EATING LOOKS LIKE

This should be the most enjoyable part. You get to eat more, and more often, and almost everything that does a great job is food worth eating.

BREAKFAST

Porridge oats with whole milk, a scoop of whey, cinnamon, cocoa, a banana, and a spoon of peanut butter melting into it.

LUNCH

Chicken, pork or salmon. A good serving of wholegrain rice. Fresh veg, roasted rather than boiled, with a small dollop of olive oil.

AFTER TRAINING

Carbs and protein together, and fast. This is the meal your body is best set up to use, so make it one you look forward to instead of one you simply knock back.

DINNER

Steak, eggs, lentils, whatever you fancy. Potatoes done properly. A giant salad with olives, cherry tomatoes, feta, toasted seeds.

IN BETWEEN

Greek yogurt with honey. Fruit. A handful of almonds. Manchego.

One thing worth knowing, and it's about making a plate better rather than bigger. Try not to stack protein on protein, or fat on fat. A chicken salad with a boiled egg, cheese and avocado on it sounds delicious, and it is, but it's three fats and two proteins. Same goes with carbs. Rice, bread and potatoes on one plate is overboard. Pick one and let the rest of the plate do something else.

Eat when you're hungry and eat often enough to fit it all in. With the exception of post workout, windows and fasting protocols are noise. What you eat and how much of it matters far more than when.

Fuel first, pleasure second. Get the fuel right and the pleasure takes care of itself. None of this is a diet. It's eating well, and a bit more of it.

THE TRAINING

There's no mesomorph training program, and there's no evidence a mesomorph needs to train differently from anyone else either. The movements that build a strong body are the same movements for everybody, which is what I said when I wrote about the three male body types. What your build changes is how fast you can add weight to the bar, not what you're lifting.

TWO SESSIONS A WEEK TO BEGIN WITH

I start almost everyone on two. Three or more can sound achievable in week one but tends to fall apart within a few weeks. When you're showing consistency and feel ready, add a third.

PROGRESSIVE OVERLOAD

This is the one that decides whether any of it works. You must aim to build on every workout. A rep, a kilo, a set, a more difficult variation of an exercise. Keep your body guessing.

WRITE IT DOWN

You can't progress what you can't remember. If you're not writing it down you're guessing, and that's often why people spend three years lifting the same weights.

EVERYTHING GETS TRAINED ACROSS THE WEEK

Cover your entire body between push, pull, and legs. The order is irrelevant.

TWICE A WEEK PER BODY PART

Better supported than any particular split, and far easier to recover from than one enormous session where you empty yourself.

THREE TO FOUR WORKING SETS IS ENOUGH

Most of your work should sit between seven and twelve reps.

SLOW IT DOWN

This is the change that often gives the best return on investment. Two-to-three seconds on the way down, then drive up with control. Slow it down, feel it, maximise every rep.

CARDIO WHILE YOU'RE BUILDING

Here's one place your build helps you. Burn a few hundred calories on a bike and you can eat them back without much thought, so cardio isn't going to derail anything.

What it does cost is recovery, and that's the bit worth protecting. Hard intervals the day before a heavy lower body session will leave your legs flat, and flat legs lift less. So by all means do cardio, just don't go overboard.

Walking is the exception. It takes very little out of your recovery.

The longer version is over on before, after or on separate days.

A WORD ON SUPPLEMENTS

Real food does the heavy lifting. Supplements are a thin safety net.

A whey protein for convenience. Creatine, five grams a day, no cycling. Vitamin D3 through the darker months. Magnesium at night if your sleep is poor. That's a small list on purpose, because most of the flashy stuff does very little.

A pre workout is a want, not a need, and there's no shame in wanting one. Pre Lab Pro is a clean option if you're after one. The caffeine comes from coffee bean and it's paired with L-theanine, so you get the lift without the jitter. Failing that, black coffee works just fine.

HOW LONG DOES IT TAKE?

Longer than you want, but nothing like as long as you fear.

Two or three kilos of lean muscle in a year is a solid year for anyone who isn't a beginner. On paper, it reads very little. However, stretched across three years it's the difference between you now and the bloke people assume has always trained.

That's the compound effect, and it's the least marketable idea in fitness. Nobody sells a course on it. It's just what happens when small numbers add up over time.

So turn the carbs up a bit, maintain protein and keep an eye on fats. Lift twice a week minimum, lift well, and write it down so you can see the progression. Then let consistency do the work.

Two other articles, depending on where you're stuck. If eating enough is the hard part, read 10 high calorie foods to help you build muscle. If you put fat on fast and lose it slowly, read lean bulking for the endomorph.

If you want more of this, I write a wee newsletter called Check It Oot. Once or twice a month, and never anything you'd need to unsubscribe from in a hurry.

Cheers, Martin