Ask ten gym-goers how many sets you need to build muscle and you’ll receive eleven different answers.

One person will insist you only need one brutally hard set. Another will recommend 25 sets per muscle. Somebody else will point out that Arnold trained for six hours per day, neglecting to mention that Arnold was Arnold and you currently need assistance opening a jar of Dolmio.

So where is the sweet spot?

For most people, around ten hard sets per muscle each week is a sensible place to start.

That is not a magical target — some will grow from less, and others be able to keep growing with considerably more.

This guide will break down the science for you.

What does “training volume” actually mean?

Training volume can be calculated in several ways.

Some coaches multiply sets x reps x weight. That approach can be useful when monitoring performance in a specific exercise, but it becomes awkward when comparing different exercises.

For muscle growth, the simplest useful method is to count the number of challenging sets each muscle receives across the week.

A set generally belongs in that total when:

• it directly or indirectly trains the muscle
• it uses a sensible repetition range
• the technique remains good
• it finishes reasonably close to failure

Warm-up sets do not count.

Neither does performing ten easy reps with a weight you could lift for another fifteen because you became distracted by the television above the cable machine.

A 2021 systematic review found that counting hard sets appears to be a useful way to monitor hypertrophy training when sets use roughly 6–20+ reps and finish at or near failure. (1)

More volume usually builds more muscle

The basic relationship is quite simple:

Performing several productive sets usually builds more muscle than performing just one.

However, each additional set appears to provide a smaller return than the one before it.

A major 2026 meta-regression which examined 67 studies involving over 2000 participants found that muscle growth increased as weekly volume increased, but the results showed clear diminishing returns. (2)

In other words, the difference between 2-10 weekly sets is likely to be far more meaningful than the difference between 20-30.

The American College of Sports Medicine reached a similar practical conclusion in its 2026 position stand. After reviewing 137 systematic reviews containing more than 30,000 participants, it reported that higher weekly volumes — around ten sets or more per muscle group — tended to produce greater hypertrophy. (3)

This does not mean ten sets represents the maximum.

It means the first several sets buy you plenty of muscle-building stimulus. From there, you can continue adding volume, but the price keeps rising while the size of the return becomes smaller.

A sensible starting point

My general starting point is approximately ten challenging sets per muscle each week.

That gives most trainees enough work to stimulate growth without immediately throwing them into a high-volume programme which requires a packed lunch.

However, your starting point should also reflect what you are doing right now.

These are merely coaching points, that I have gathered via decades of working with people in the gym at various stages of their fitness journey, not rigid lines between “optimal” and “useless”.

They’re just here to get you started on the right track.

Training age does not decide your volume for you

A beginner usually needs less work because resistance training is a new stimulus.

They also need time to learn the exercises and develop tolerance for training, so starting with 20 sets per muscle would be overkill disgused as “hardcore”.

On the flipside, that doesn’t mean every experienced lifter needs massive volume.

They might use heavier weights, produce more force and push each set considerably harder than a beginner. Those sets can create more fatigue, which would require adequate recovery. Unfortunately, our muscles do not receive a certificate on the second anniversary of our first workout granting us an additional 10-20 sets in tolerance — things like training intensity, sleep, stress and calorie intake all still play an important role in the time it takes for us to recover from a hard workout.

You’re probably doing more sets than you think

The 2026 volume meta-regression I mentioned earlier made an important distinction between direct and indirect sets.

A direct set trains a muscle as one of the main targets; a set of biceps curls therefore counts as one full set for the biceps.

An indirect set trains the muscle as a meaningful assistant; your biceps work during rows and pulldowns, but they are not the primary target.

The researchers tested several ways of counting these sets, and decided on this format:

• a direct set counts a one set
• an indirect set counts as half a set

This is known as counting fractional sets.

Fractional set counting

Imagine your weekly upper-body training includes:

• 8 sets of chest press
• 10 sets of pulldowns
• 4 sets of biceps curls
• 4 sets of triceps extensions

The chest receives approximately eight direct sets, and the back receives ten direct sets.

The biceps receive four direct sets and approximately five indirect sets from the pulldowns, giving them nine fractional sets. The triceps receive four direct sets and approximately four indirect sets from the chest work, giving them eight fractional sets.

This is why adding ten direct sets for every muscle can quickly create a ridiculous programme — your arms were already attending the workout; they did not spend the compound exercises waiting in the car!

A set must be hard enough to count

Ten challenging sets and ten comfortable sets are not the same dose.

The closer a set finishes to failure, the more muscle fibres must contribute to keeping the weight moving. Current evidence suggests that muscle growth generally improves when sets finish closer to failure, but that does no mean you need to wipe yourself out every single time. (4)

A 2024 study compared sets taken to failure with sets stopped at approximately one or two repetitions in reserve. Both approaches produced similar quadriceps growth, but failure caused greater repetition and lifting-velocity loss. (5)

For most exercises, finishing with roughly one to three good repetitions in reserve is a useful target. Isolation exercises can be pushed to failure when it is safe and appropriate.

Remember, failure is a tool — if every set of bench press finishes with your training buddy hitting upright rows while shouting, “It’s all you, baby!”, then you are wasting valuable gym time.

Should you peform all of your sets in one workout?

Weekly volume appears to matter more for hypertrophy than the exact number of days used to perform it.

The 2026 meta-regression found that increasing frequency did not have a clear independent effect on muscle growth once total volume was equalised.

That means training a muscle three times per week is not automatically superior to training it twice.

However, training frequency is still be a useful tool, because it gives us an opportunity to spread the workload.

If your chest requires twelve weekly sets, you could perform:

• all twelve sets on Monday
• six sets on Monday and another six on Thursday
• four sets on Monday, Wednesday and Friday

All three arrangements deliver twelve weekly sets, but the last two make it easier to maintain good performance across every set.

If your final exercises have become a collection of shortened reps, improvised body English and quiet sobbing, some of that work may be better moved to another day where you can guarantee every single set is great.

Is “junk volume” real?

Yes, but it is not a fixed number.

A set becomes low-value when it adds plenty of fatigue but very little useful stimulus. This can happen when:

• the set finishes nowhere near failure
• technique deteriorates badly
• the target muscle is no longer doing the work
• rest periods are too short to restore performance
• the exercise simply repeats work that’s already been done (e.g. adding cable flyes after already doing plenty of dummbell flyes)
• the additional fatigue harms future workous, hindering overall performance
• volume continues increasing despite no improvement in results

A 2022 systematic review compared moderate volumes of 12–20 weekly sets with higher volumes above 20 in young, trained men. There was no clear difference for quadriceps or biceps growth, although higher volume did slighly favour the triceps. (6)

That mixed result is important.

Like I said; there is no fixed number for everybody. It appears that different muscles, exercises and trainees may respond differently, and the research does not support the concept of one universal cut-off point where productive training suddenly becomes “junk”, so use the checklist above as a guide.

When should you add more sets?

Consider increasing volume when:

• you have trained the muscle consistently for several weeks
• your technique and effort are good
• nutrition supports muscle growth
• sleep and recovery are solid
• you’re no longer making measurable progress
• the muscle feels ready to train again before the next scheduled session

Add extra volume gradually.

An extra 2-4 weekly sets for one muscle is enough to test whether more work helps. Keep the rest of the programme reasonably stable so you can judge the result.

Do not add four sets to every muscle simultaneously unless you particularly enjoy solving mysteries.

If progress improves, keep the extra volume. If nothing changes — or performance gets worse — you have learned that more volume was probably not the missing ingredient.

When should you remove sets?

Consider reducing volume when:

• performance repeatedly declines
• soreness regularly interferes with the next workout
• joints or connective tissues become irritated
• later sets are dramatically worse than earlier ones
• enthusiasm for training ha fallen through the floor
• progress became worse after volume was increased
• sleep, calorie intake, or life circumstances no longer support the extra workload

One disappointing workout does not mean that your programme contains too much volume. Everyone occasionally experiences poor performance in the gym after a terrible night’s sleep, a day of poor eating, or spending an entire day fantastising about stapling your annoying co-worker’s tongue to their fucking forehead.

Instead, look for a long-term pattern.

If several sessions are deteriorating and recovery is becoming increasingly hard, then removing a few sets might actually allow for more productive work.

This is something I have first-hand experience with, and as much as it mentally killed a “gym rat” like myself to reduce volume, it was one of the best things I ever did during a time when my home life had turned into a fucktacular shitnado of ass.

A practical example

Here is how an upper-body programme might delive enough volume without needing lots of extra work for smaller muscle groups.

Monday

• Bench press: 3 sets
• Incline dumbbell press: 2 sets
• Seated row: 3 sets
• Lat pulldown: 2 sets
• Biceps curl: 2 sets
• Triceps pushdown: 2 sets

Thursday

• Machine chest press: 3 sets
• Cable flye: 2 sets
• Prone dumbbell row: 3 sets
• Underhand-grip pulldown: 3 sets
• Biceps curl: 2 sets
• Triceps pushdown: 2 sets

The approximate weekly fracional volume would be:

So how much volume is “perfect” for you?

Here’s the short version of this article:

• Count challenging sets, not wam-up sets.
• Start at about ten fractional sets per muscle each week.
• New or returning trainees can reduce that to 6-8.
• Count indirect work as roughly half a set.
• Keep most of your sets within 1-3 reps of failure.
• Spread higher volumes across the week if it helps you to maintain performance.
• If you are progressing, keep the volume where it is.
• If progress stalls while recovery remains good, add more volume.
• If performance and recovery both decline, remove some volume.

Remember, your goal here is NOT to perform the highest number of sets you can get away with.

The evidence shows that higher volumes can continue producing additional muscle growth., albeit with diminishing returns. The goal is to perform enough good work to encourage growth, while also allowing for speedy recovery so that your efforts in the gym can be consistent.

It’s a fine line to straddle, but this guide will keep you on the right track!

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