Are All Rep Ranges Really the Same for Hypertrophy?

The Truth About Bodybuilding Reps

As long as you’re training to near failure, all rep ranges are the same for muscle growth. Popular idea, but is it true? Answers here.

Rep Ranges: Don’t Keep It Simple?

To become a popular strength coach or “fitness personality,” it helps to say things people like to hear.

When I started out as both a coach and author, I craved new methods and revolutionary approaches. Innovators that broke the mold were the most popular sources of info. We’d get excited about learning the new method. We wanted to know more about why and how it worked. This led to the development of even more novel methods.

And yeah, it also led to complex programs and created some confusion about how to put all of that info together into an effective plan. But that was part of the fun. Heck, it was the most fun part!

Today, the pendulum has swung the other way. People want simple – easy to apply and easy to understand. They want REASSURING. There’s nothing wrong with that… until simple becomes “too simple.” A lot of pieces are dropped for the sake of simplicity.

The problem? This often leads to beige (a French expression that loosely translates to bland or tasteless) programs that might be simple but are very unmotivating. And, in some cases, “too simple” actually leads to faulty information.

One such example? The current trend of saying this:

“Every rep range will trigger the same amount of hypertrophy provided that you do your set with the same level of effort (proximity to failure).”

In other words, if you do 6, 12, 20, or 30 reps per set and stop one rep short of failure, you’ll get the exact same amount of muscle growth. But is that right?

Here are some quick thoughts:

Now let’s dive into the details.

How It Started

To the best of my knowledge, the idea that all rep ranges are the same comes from a study I wrote about myself in a previous article.

Basically, a group doing 3 sets to failure (leg extension) at 30% of their 1RM had the same hypertrophy gains as a group doing 3 sets to failure at 80% (but half the strength). While interesting, don’t forget this study was conducted on beginners using a single exercise. Not really applicable to our reality.

Then came the theory of “effective reps” by Chris Beardsley. (Note that I do subscribe, in large part, to this theory.) An effective rep is a repetition in a set that combines the two key factors to stimulate growth:

1. A high recruitment of the growth-prone fast-twitch fibers.
2. A high level of effort to complete the rep. This means that even though you’re trying to push the weight as hard as you can, it moves slowly.

You need both for a rep to be effective at stimulating growth:

• If you move a weight explosively, you’ll recruit a lot of fast-twitch fibers, but the muscle contracts too fast to have maximum tension. So, it won’t produce much growth.
• If you go slow on purpose with a light weight, you get a lot of tension on the recruited fibers but not enough fast-twitch recruitment to be effective.

In a normal set, regardless of the number of total reps you do, only the last 5 reps (if you go 1 rep short of failure) will combine both conditions and be effective for growth. Hence the belief that the number of reps you do doesn’t matter – if you push your set hard.

But Is That True?

In theory, it is. And it’s intellectually elegant and makes training super simple. If muscle growth is all you care about, you can use any rep range and load, and they’ll work equally, provided you use the same effort level.

The modern lifter loves simplicity, but reality isn’t so black and white.

For one thing, various rep range or rep-execution styles have effects other than muscle growth – effects that might be as equally desirable as growth.

For example, if you perform 6 reps (heavy weight) 1 rep short of failure, and I do 20 reps (light weight) 1 rep short of failure, we might get a similar hypertrophy response. But you’ll gain more strength than me because lower reps with heavy weights improve neurological factors more than lighter weights for high reps.

But I will gain more resistance and maybe favor increased glycogen storage (provided that sufficient carbs are ingested) by upregulating GLUT-4 more than lower/heavier reps.

Other things:

• Lower reps with heavier weights will improve neurological factors more than higher reps, leading to more strength gains.
• Higher reps can increase muscle resistance and lactate tolerance.
• Lower reps/heavier weights can have a bigger impact on myogenic tone than higher reps (making muscles look harder even at rest).
• Higher reps can possibly upregulate intramuscular glycogen storage, making a muscle appear fuller (if you’re eating enough carbs).
• Doing the initial reps of a set (the easy ones) as explosively as possible also improves neurological factors and your capacity to produce power. This could benefit an athlete wanting more muscle mass but also more explosiveness. For example, if you do 10 reps, only the last 5-6 will be hard. If you do the first 4-5 explosively on purpose, they might not build much muscle, but they will increase power output.
• Doing the initial reps of a set slowly on purpose can help develop movement control and improve intramuscular tension and the mind-muscle connection. This can be useful for beginners or for a muscle you have a problem developing.
• If you hold the bottom position of an exercise, where the target muscle is being stretched under load, for 1-2 seconds, you can get extra growth via the stretch-induced hypertrophy pathway. And you increase muscle tension at the start of the lifting portion by reducing the stretch reflex.
• If you voluntarily use a strong rebound in the bottom of a rep, you train your peripheral nervous system to better use the stretch reflex. This is very useful for athletes requiring speed, power, and agility.
• If you perform very slow eccentrics/negatives, you increase motor cortex activation, speeding up motor learning (useful for beginners). It can also help build up your tendons and reduce the risk of injuries.
• Performing very high reps (40 or more) can, over time, increase the number of capillaries going to the muscle. This speeds up recovery and helps with endurance. (See The 100-Rep Method for Big Legs.)
• Heavier loads (lower reps) will have a stronger potentiation effect on the nervous system. Doing that type of work early in the workout helps increase performance on all subsequent exercises.
• Lighter weights with a slower speed of movement done at the beginning of a workout can help you “feel” the main muscle better when you switch to a big basic lift afterward.

So no, every repetition number/range is not equal. That’s oversimplistic and short-sighted, but it’s a good marketing strategy.

And Then There’s This Study

If all rep ranges are equal for hypertrophy (provided that the same effort level is used), then it would mean that combining more than one rep range in a workout, or a week, wouldn’t provide any added gains compared to only performing one type of rep range.

The following study (1) compared 8 weeks of training (three times per week for the lower body using squats and leg extensions) for three different protocols:

• Group 1: Heavy (low reps progressing from 82% to 94% using 3-5 reps/set
• Group 2: Light (high reps using 28-34% to muscle failure for 2-3 sets)
• Group 3: Combination of both

The group combining both rep ranges had more muscle growth than both groups utilizing only one range.

Although this is only one study, it’s still an interesting finding. It shows that there might be benefits from combining various rep ranges, even strictly for growth.

My Recommendations

• I’ve always had my best results by combining at least two rep ranges in a workout. Some of my most effective workouts (The Layer System and HSS-100) use four ranges in a workout for the same muscle.
• If you’re interested in more than just size, use various rep ranges to train qualities useful in your activity. For example, an explosive athlete will do his hypertrophy work differently (different rep ranges and execution) than an endurance athlete.
• If you want to increase strength as much as size, start with big lifts with lower reps, even in an hypertrophy phase (4-6 reps, for example) and increase the reps gradually from exercise to exercise.
• If you’re training using feeling and pump as your target, start with one exercise for higher or intermediate reps (targeting the main muscle you want to develop) at the beginning of the workout.
• If going low reps/heavy weight on an exercise prevents you from properly feeling the muscle you want to stimulate, include higher rep work with maximum tension and mind-muscle connection for that muscle. In fact, if you don’t feel the target muscle doing the work, go lighter using higher reps on that movement, too.

I have a theory. It may be dumb, and you may prove me wrong. But here it is.

There seems to be some disagreement over using sub-maximal weights for straight sets as being useful. For example, in 531 there are supplemental schemes where you do 5×5 at a first set last weight, something that may only be ~60-70% of a 1 rep max. You are not close to failure in a conventional sense, and many would say these are not effective reps. But, I believe this can work well as many (if I can include myself) have seen nice results from approaches like this. Here’s why.

My theory: If you approach that set of 5 with your maximal effort, meaning you essentially move the barbell with maximal speed and explosiveness each rep, you effectively are taking each rep to “failure”, meaning you can’t again duplicate that effort within that working set. If I’m benching 185 lbs for a set of 5 (~300 lb max), but each rep is done as explosively as possible, each rep will be a bit slower than the last one. Each rep was the max effort (not the max weight) that I could have done. As bar speed slows, the set is over. Even if I have plenty of “reps in the tank”, once bar speed dips you rack it and call it a set. This is in-line with Wendler’s approach to lifting: go lighter than you think but make sure each rep is explosive and crisp as possible. I have had much better results this way and just feel better than when I would grind heavier sets.

What do you think about this? Sure, if you move the weight with the same speed regardless of the weight on bar, you won’t get much out of 5 slow, non explosive reps if you could have done another 15 reps in an identical fashion. But if you explode the weight up with your full effort, then the whole “effective reps” argument – that’s based solely on the weight on the bar – breaks down.

It sounds good in theory and it works… in part.

For STRENGTH it works. Because the intent to violently accelerate the bar can compensate for the lack of load. This is called compensatory acceleration training. And since Force = Mass x Acceleration, by accelerating a moderate load you can create the same force production as lifting a heavier weight.

However, it doesn’t work as well for hypertrophy because, and this is important, the faster a movement is, the less tension there is on the muscles. That’s because at a high contraction speed, the actin-myosin cross-bridges don’t stay active long and this leads to fewer bridges at any given time. And the amount of muscle tension producted is proportional to the number of bridges formed at any give time.

That’s why things like plyometrics, jumps, throws, and even the olympic lifts have a negligible impact on muscle growth despite leading to a) a very high force production and b) a very high fast-twitch fibers recruitment.

To get reps that do trigger significant growth, a rep must be fairly slow even as you try to accelerate it/push as hard as you can.

Now, if you are using 70% for 5×5 you will probably get 1 effective rep per set. So that gives you 5 for the whole protocol. Which is sufficient to get SOME growth especially if you hit that muscle a few times per week (around 20-25 effective reps/muscle per week seems to be the level where significant growth occurs).

If you count your main lift, which can provide 5+ effective reps (depending on the week and how many reps you get) you can likely get enough overall effective reps in your week to get acceptable growth.

I appreciate the detailed response. Your point is well taken that this wouldn’t be ideal to those looking to maximize hypertrophy.

Question: When you are talking about effective reps per set, is this limited to hypertrophy? If one were training for athleticism and performance, would this still be true? I am in the minority on these boards in that I train solely for performance and prefer the look of an athlete over a body builder. For someone like this, would it change your answer at all?

Yes, it’s limited to hypertrophy.

As I wrote in the article above, if you perform the “easy” reps of a set with maximum intent to accelerate, even though the reps do not contribute much to hypertrophy, they will have a positive impact on power production capacity, and strength to some extent.

If effective reps applied to everything, then jumps, plyometrics, throws, and even sprints would be worthless for performance improvements… and they obviously aren’t.

I don’t need to change my answer because that’s actually what I said in both my answer and article.

i talked about effective reps/hypertrophy only because that’s the way your original question was formulated.

I don’t think ANY non-competitive lifter values simplicity based on the questions I see posted across the interwebs, LOL! People will find a way to complicate even the most simple of things.

I competed (key word) in Olympic lifting then powerlifting for well over a decade. The high volume, low rep work but always leaving some in the tank is simply the magic for strength. Sheiko programs did more to get my powerlifting total up than anything…but I actually “shrunk” during peaking cycles. I understood why but I always used it as an example for (mainly) women who had the fixed mindset of “heavy weights make you bulky, high reps tone”.

Fast forward to post-competitive years and I almost exclusively use rest-pause training and got to my absolutely most muscular (but not strongest) bodyweight of 200-lbs at 5’7″ without being a slob. 99% of my training for that period was the “Best Damm…for Natural Lifters ” series👍

This is so true.

Good article and good discussion. I have always liked varying my rep ranges when training for hypertrophy – it keeps things more interesting for me and it has just never made a lot of sense to me to do a set of 6-8 on flies for example – so the fact that varying the rep ranges may improve hypertrophy outcomes is music to my ears.

100% agree. The obsession with “optimal” rep ranges for hypertrophy is mostly mental masturbation. If people want it simply put: do all the rep ranges for hypertrophy but work hard. Strength is a bit less vague, IMHO.

Key the comments on “well, it depends on how do you define strength. Relative? Absolute? Specific vs generalized?”. Knock it off. You know what I mean.

I look at this in a very simplistic view.
Do heavy low reps so that you can do heavier high reps for hypertrophy. (Disclaimer: 10reps were my high rep sets)

In other words: Get stronger so you can get bigger. This is done in cycles of 6 to 10 weeks.

Coach Thibaudeau, no joke, how are you such a genius / Beast / God of a trainer? I’ve been instinctively feeling that different rep schemes in sets are a good idea, yet I’ve been told multiple times that intensity is more important than rep ranges. Finally! An explanation on the benefits of multiple rep ranges that gets specific!