Myo-Reps: What They Are, How They Work, and When to Use Them

Myo-reps are a strength-training method to get more high-quality, muscle-building work in less time, developed and made popular by Norwegian strength coach Børge Fagerli.

Instead of doing several normal sets with long rests, you do one hard “activation set,” rest for a bit, then do several more tiny mini-sets with the same weight.

Myo-reps give you the same strength and muscle growth as regular sets in a fraction of the time.

Here’s how they work, why they work, and how you should use them.

What Are Myo-Reps?

A myo-rep set has two parts.

You start with an activation set. That’s just a regular set with anywhere from 8 to 30 reps, depending on the exercise and your goal.

Note: “activation set” makes it sound like a kind of easy warm-up set, but that’s not the case. It’s a real set, and the last few reps should slow down to the point where you have only one or two good ones left.

Fagerli himself used to recommend 15–30 reps, but he has since revised those recommendations to 8–15 reps, with up to 30 working well.

There are no strict “you shall do this”-rules about myo-reps, and I bet anywhere from 6–8 reps all the way up to 30+ reps will work just fine.

Then you rest for a short time (max 30 seconds—any longer, and you’ve recovered too much and diluted the effect), and do a mini-set of a few (3–5) reps with the same weight. Rest a little again. Do another mini-set.

Be sure to put the weight down after each mini-set (or at least lock out if you’re doing something like a leg press), or you won’t be able to recover enough to do yourself justice in the next one.

Repeat until your reps drop off, you can’t maintain good form, or you hit your planned number of mini-sets (up to 5).

Here’s what a simple example might look like:

Choose a weight you can lift for at least 15 reps.

1. Do 17 reps, stopping around one rep away from failure
2. Rest 10 seconds
3. Do 5 reps
4. Rest 10 seconds
5. Do 4 reps
6. Rest 15 seconds
7. Do 3 or 4 reps
8. Rest 20 seconds
9. Do one final mini-set, get 3 reps, then stop

On paper, that might look like “17 + 5 + 4 + 4 + 3.” In the gym, it feels like one long, grueling set.

Congrats, you just squeezed the muscle-building equivalent of 3 or 4 regular sets into less than 2 minutes.

Myo-reps are quite tough. When I first tried them, I couldn’t get any more quality work done in that workout. They also require that you know how to perform the exercises correctly, and that you’re able to estimate when you’re going to reach failure in a set with decent accuracy.

That’s probably why Fagerli himself recommends you have at least 3 months of training experience before you give myo-reps a go.

Myo-Reps vs Rest-Pause

If you’ve been around the iron block, you’ve probably heard about rest-pause training. And if you have, you’re probably noticing that myo-reps sound very similar.

And they are. They’re closely related. But they’re not the same.

Besides rest-pause having been around for ages (at least since the 1940s), the big differences are twofold:

• Number one, with rest-pause training, you usually use heavier weights, not ones you can do up to 30 reps with.
• Number two, rest-pause training is about going to failure. You take each set to the point where you physically cannot do another rep. With myo-reps, you leave one or two reps in the tank. As Fagerli puts it, you manage fatigue rather than chase it.

Why Myo-Reps Work

Myo-reps mean you can get more “effective reps” (as in effective for building muscle).

When you do a set with a moderate or light weight, the first few reps are easy peasy. It’s only as you close in on muscular failure that you recruit your high-threshold motor units and the fast-twitch muscle fibers, the guys with the greatest growth potential.¹

That means that with each rep, your body has to recruit more muscle fibers to keep the weight moving. By the time you’re close to failure, the set is worth more hypertrophy bucks than at the start.

And that’s “effective reps”: the reps near failure mean a lot of effort, fiber recruitment, and mechanical tension, the things that really drive muscle growth.

Myo-reps keep you close to that productive part of a set by cutting down on the buildup reps that get you there, the reps where not that much happens.

After the activation set, you rest long enough to squeeze out a few more reps, but short enough so that the mini-sets are hard from the get-go and you stay in the most muscle-building zone.

What RIR Means and Why It Matters

RIR stands for Reps in Reserve, or how many more reps you could have eked out before hitting failure.

A 1–2 RIR activation set means you stop when you feel like you could do one or maybe two more reps, but not more than that.

RIR is pretty hard to estimate; research shows that lifters often underestimate how close to failure they actually are, especially beginners.²

Myo-Reps for Muscle Growth

Myo-reps are excellent for building muscle. Not necessarily better than regular straight sets, but just as good. And similar results from much shorter workouts can be a big win when time is tight.

Myo-reps likely work best with exercises where the limiting factor is the muscles you’re trying to hit. The more stable and low-skill the exercise, the better myo-reps fit.

• A brutal set of myo-rep leg extensions? Great. Painful, but great.
• A brutal set of myo-rep squats? Probably not the best idea.

Full-body fatigue can wreck your form fast. In a 5-step myo-rep squat set, your cardiovascular system, nervous system, and lower back will likely give out long before your quads or glutes reach actual muscular failure. And that kind of defeats the purpose.

But with an easy exercise like the leg extension? Instead of doing 3 sets of 15 reps with 2 minutes of rest between sets, you could do a single myo-rep set: 15 reps, rest 15 seconds, then 5, 5, 4, 4 more reps.

Your quads get blasted with a substantial growth stimulus in a fraction of the time.

You want to make sure your activation set is hard enough, just a rep or two shy of failure. If you stop with more reps in the tank, the mini-sets become less meaningful. You should still be so close to failure when you start one of them that you can only do a couple more reps.

Myo-Reps for Strength

Myo-reps are mainly a hypertrophy and strength-endurance technique, not the best method for maximizing one-rep-max strength.

Don’t get me wrong, you can get stronger with myo-reps as part of your program, even if they’re not the main driver of strength gains.

It also depends on what you mean by strength.

If you mean “are myo-reps the best way to improve my one-rep max in the squat, bench press, or deadlift?” then no, probably not. Or wait, scrap the probably.

When your main goal is to lift as heavy as possible, especially in an exercise that’s demanding technique-wise, you need heavy practice, repeatable form, longer rest periods, and lower-rep sets. Myo-reps are none of those things.

That said, myo-reps can definitely help you get stronger.

• One way is by helping you build muscle, as we’ve already talked about. A bigger muscle is almost always a stronger muscle.
• Another is by helping you bring up weak points. For example, if you’re a powerlifter, you could include myo-rep training on leg extensions for quads, leg curls for posterior chain balance, rows for upper-back volume, triceps pushdowns for bench lockout, or lateral raises for shoulder development.

For example, the 2026 study I mentioned earlier, when we talked about muscle growth, also looked at strength gains. Both the myo-reps group and the traditional sets group increased their strength to a similar degree.

Just be careful using myo-reps on technical compound lifts. We’ve seen that it can work with the bench press, but I still think something like a myo-rep deadlift set is a bad idea. You quickly build up fatigue, your technique decays, and the risk-to-reward ratio doesn’t look very good.

For strength-focused lifters, I’d put myo-reps in the accessories toolbox, not in the main heavy lifts toolbox.

The Best Exercises for Myo-Reps

Myo-reps are excellent for isolation and machine exercises. You can focus on a specific muscle group and train close to failure without compromising balance or coordination, and without your form crapping out.

Stable compounds like the bench press work, as long as you don’t go super heavy with low (<6) reps. And you need a spotter.

Poor choices include exercises like heavy barbell squats, heavy deadlifts, heavy bent-over rows, Olympic lifts, good mornings, and very heavy free-weight presses.

You want to be fresh and focused when you do these lifts. They also often lend themselves to higher weights and lower reps than myo-rep training usually calls for. And they give you so much systemic fatigue that the rest-pause logic breaks down.

Some examples:

Exercise	Myo-Reps?
Lateral Raise	✓ Excellent
Biceps Curl	✓ Excellent
Machine Fly	✓ Excellent
Leg Extension	✓ Excellent
Leg Curl	✓ Excellent
Leg Press	✓ Good
Machine Chest Press	✓ Good
Bench Press	✓ OK (with spotter)
Squat	✗ Not recommended
Deadlift	✗ Avoid
Olympic Lifts	✗ Never

Calves, side delts, biceps, triceps, hamstrings, quads (isolation), and upper-back often work great with myo-reps. Exercises that are really heavy on the lower back usually don’t. The thing that fails first likely won’t be the muscle you’re trying to fatigue.

How Many Myo-Rep Sets Should You Do?

One myo-rep set is considered to be 3 to 4 traditional sets, depending on how hard you push it and how many mini-sets you do.

Note that there are no studies directly quantifying this relationship, so we’re in speculation territory now. Don’t get too hung up on exact conversions.

Regardless, you don’t need many myo-rep sets. One or two in a workout can be plenty. Three or four work great if we’re talking isolation exercises for smaller muscle groups.

• For smaller muscles like side delts, biceps, triceps, calves, and rear delts, you can do more of them. The fatigue is local, and you recover fast.
• For bigger movements like machine presses, rows, pulldowns, and maybe even leg extensions and curls, I’d be more conservative.

Let’s take a look at a practical weekly setup:

• Use myo-reps for 2 to 6 exercises per week, total, not every exercise in every workout.
• Use them near the end of your sessions.
• Start with one myo-rep sequence per workout.
• Add more only if you feel that you can recover.

For example, if you did a push workout (chest, shoulders, and triceps), you could do your heavy presses with straight sets, then finish off each muscle group with myo-rep sets of lateral raises and triceps extensions, one of each.

A Simple Myo-Rep Workout Example

Here’s how you might use myo-reps in an upper-body hypertrophy workout.

1. Bench Press: 3 sets × 6 reps, normal rest
2. Lat Pulldown: 3 sets × 8 reps, normal rest
3. Overhead Press: 3 sets × 8 reps, normal rest
4. Dumbbell Row: 3 sets × 12 reps, normal rest
5. Incline Dumbbell Press: 3 sets × 12 reps, normal rest
6. Dumbbell Lateral Raise: 1 myo-rep sequence
7. Barbell Curl: 1 myo-rep sequence
8. Overhead Cable Triceps Extension: 1 myo-rep sequence
9. Reverse Dumbbell Fly: 1 myo-rep sequence

Notice the pattern: heavy, technical work first. Myo-reps later, on safer and more stable exercises.

This is our Upper Body Workout (Hypertrophy Focus), adapted for myo-rep training. You’ll find it in the StrengthLog workout tracker app.

How to Progress Myo-Reps

Progression with myo-reps is simple, but you do need to track it.

Let’s say you’re doing barbell biceps curls with 60 lb, and you’re going for 15 reps in your activation set.

Today, you got:

13 + 4 + 4 + 4 + 3 reps.

Next workout, you might hit:

14 + 4 + 4 + 4 + 4 reps.

Then:

15 + 5 + 5 + 4 + 4 reps.

Once you reach the 15 reps you were aiming for and your mini-sets feel good and clean, increase the weight slightly and start again.

Very similar to your standard form of weight and rep progression.

You can also progress by adding one mini-set, but be careful here. More is not automatically better. If your myo-rep work starts interfering with your next workout, you’re probably doing too much or adding too much too soon.

Are Myo-Reps Better Than Normal Sets?

No, myo-reps are not automatically better than straight sets, except for one thing. They are more time-efficient. That’s the big advantage.

Regular sets with enough volume, good technique, and progressive overload are hard to beat for any kind of strength training goal. Myo-reps are another way to organize your training, but they aren’t universally better or worse.

They likely give you a similar muscle-building stimulus in less time, especially on exercises where short rests don’t build up fatigue in your entire body. Which is fantastic, if that’s what you want or need.

But if you’re training for maximal strength or doing complex lifts, normal sets are better. Myo-reps can still be part of your plan, but they don’t shine for these things.

Final Rep

Science doesn’t show that myo-reps are superior. But it does show that training close to failure matters for building muscle, that rest-pause methods work, and that you can get as good results in much less time.

Myo-reps can give you all of the above. And that’s plenty.

I hope this article has given you insights on how you can use them to squeeze more muscle-building value out of less time. Thanks for reading, and good luck with your training!

Want more?

Listen to episode 45 of The Strength Log podcast, where Daniel and Philip discuss techniques to save time in the gym, including myo-reps.

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Last reviewed: 2026-05-19

References

1. Clinical Neurophysiology,Volume 110, Issue 7, 1 July 1999, Pages 1270-1275. The relationship of motor unit size, firing rate and force.
2. PeerJ. 2017 Nov 30;5:e4105. Ability to predict repetitions to momentary failure is not perfectly accurate, though improves with resistance training experience.
3. Strength and Conditioning Journal, August 15, 2025. Advanced Resistance Training Strategies for Bodybuilding: Tools for Muscle Hypertrophy.
4. Journal of Strength and Conditioning Research, May 7, 2026. Similar Strength and Hypertrophic Adaptations in Less Time? Myo-Reps vs. Traditional Straight-Sets in Resistance-Trained Men.