How many sets per week do you need to build muscle?

The short answer

Most people build muscle on roughly 10 to 20 hard sets per muscle group per week.^{1Schoenfeld, Science and Development of Muscle Hypertrophy, 2nd ed., p. 93.},^{2Helms et al., The Muscle & Strength Pyramid: Training, 2nd ed., p. 62.} Newer lifters can grow on less; advanced lifters tend to need the upper end.^{1Schoenfeld, Science and Development of Muscle Hypertrophy, 2nd ed., p. 93.} Much past 20 sets can be too much.^{2Helms et al., The Muscle & Strength Pyramid: Training, 2nd ed., p. 62.} Start within that range and adjust for the client. Twenty sets is twice the work of 10, and individual needs vary widely.^{3Helms et al., The Muscle & Strength Pyramid: Training, 2nd ed., p. 88.}

Why count sets per muscle per week?

You can measure volume in total reps, volume load (sets × reps × weight), or number of sets. All have drawbacks. A set of 20 light reps can rack up more volume load than a heavy set of 5 without being a bigger stimulus.^{4Schoenfeld and Snarr (eds.), NSCA’s Essentials of Personal Training, 3rd ed., p. 425.}

The NSCA’s personal training text calls set volume “arguably the best way” to gauge volume in personal training. Most meta-analyses on muscle growth use it, and it holds up across loads from about a 6-rep max to 20 or more reps.^{4Schoenfeld and Snarr (eds.), NSCA’s Essentials of Personal Training, 3rd ed., p. 425.}

What counts as a hard set?

A set counts toward growth when it’s taken reasonably close to failure. One common definition of a “hard set” is any set stopped 5 or fewer reps short of failure, with a load between about 30% and 85% of the lifter’s one-rep max.^{5Israetel et al., Scientific Principles of Hypertrophy Training, p. 60.} Within that range, lighter loads with more reps and heavier loads with fewer reps give roughly similar growth per set.^{5Israetel et al., Scientific Principles of Hypertrophy Training, p. 60.}

When counting sets, keep a few things in mind:

• Loads as light as 30% of a one-rep max can build similar muscle to heavier loads, as long as sets are hard.^{6Schoenfeld and Snarr (eds.), NSCA’s Essentials of Personal Training, 3rd ed., p. 422.}
• Very heavy, low-rep sets contribute less growth per set, so more sets are needed for the same growth.^{4Schoenfeld and Snarr (eds.), NSCA’s Essentials of Personal Training, 3rd ed., p. 425.}
• Most sets don’t need to reach failure. Schoenfeld recommends stopping most sets 1 or 2 reps short, saving failure for the last set of an exercise, and using it more sparingly on big multi-joint lifts.^{7Schoenfeld, Science and Development of Muscle Hypertrophy, 2nd ed., p. 140.}
• A row trains the biceps as well as the back, and heavy warm-up sets add some volume too. It’s hard to say exactly when those sets “count”.^{8Helms et al., The Muscle & Strength Pyramid: Training, 2nd ed., p. 61.}

Sources differ slightly on how close is close enough. The 5-reps-in-reserve cut-off comes from an expert-practitioner text, while the academic textbook’s advice of 1 to 2 reps in reserve is stricter. For most clients, stopping most sets 1 to 3 reps short is a practical middle ground.

Do more sets per week mean more muscle growth?

The evidence that more sets produce more growth is strong. A meta-analysis grouped studies by weekly sets per muscle: under 5 sets, 5 to 9, and 10 or more. Average muscle growth rose with each band, from 5.4% to 6.6% to 9.8%.^{9Schoenfeld, Science and Development of Muscle Hypertrophy, 2nd ed., p. 89.}

The averages hide individual differences. In one well-designed study, untrained subjects trained one leg with about 15 weekly sets and the other with about 5. After 12 weeks, about 44% grew clearly more on the higher volume, about 9% on the lower volume, and the rest responded about the same to both.^{1Schoenfeld, Science and Development of Muscle Hypertrophy, 2nd ed., p. 93.}

Growth doesn’t keep rising as sets increase. Volume and growth are thought to follow an inverted U: gains peak at some level, and more volume beyond it can impair them.^{9Schoenfeld, Science and Development of Muscle Hypertrophy, 2nd ed., p. 89.} In one study, trained men did 9, 18 or 27 weekly sets for the biceps. All three groups grew, but the 18-set group grew meaningfully more than either of the others.^{10Helms et al., The Muscle & Strength Pyramid: Training, 2nd ed., p. 60.}

Where that peak sits is unsettled. Some studies in trained lifters show gains up to 30 or more sets per muscle per week, while others plateau at 10 or fewer.^{9Schoenfeld, Science and Development of Muscle Hypertrophy, 2nd ed., p. 89.} Helms and colleagues note that the two studies favoring 30+ sets used well-trained lifters and navy men living on a ship with consistent sleep and food, conditions most clients don’t have.^{2Helms et al., The Muscle & Strength Pyramid: Training, 2nd ed., p. 62.}

How many sets per week do beginners and advanced lifters need?

Training age matters most. The less experienced the lifter, the less volume it takes to grow.^{11Israetel et al., Scientific Principles of Hypertrophy Training, p. 61.} Someone who has never trained their legs can grow them on as little as one set a week for a while.^{11Israetel et al., Scientific Principles of Hypertrophy Training, p. 61.}

Client	Weekly hard sets per muscle	Sessions per muscle per week
Untrained, or short on time	Fewer than 4 can still work12Ozemek et al., ACSM’s Guidelines for Exercise Testing and Prescription, 12th ed., p. 359.	Not specified
Novice	10–12	2–3
Intermediate	13–15	3–4
Advanced	16–20	3–5

The novice to advanced rows come from The Muscle & Strength Pyramid: Training.^{13Helms et al., The Muscle & Strength Pyramid: Training, 2nd ed., p. 208.} The first row comes from ACSM’s guidelines, which say untrained people can improve on as little as one set per muscle group per session.^{12Ozemek et al., ACSM’s Guidelines for Exercise Testing and Prescription, 12th ed., p. 359.} The NSCA adds that lower-volume programs produce substantial gains in novice and intermediate clients, and that short workouts of about 30 minutes are an efficient option for clients with limited time or budget.^{14Schoenfeld and Snarr (eds.), NSCA’s Essentials of Personal Training, 3rd ed., p. 426.}

ACSM describes the minimum that can work for untrained people or those short on time. The 10–20 range aims to build as much muscle as possible.

Volume landmarks: MEV, MAV and MRV

Israetel and colleagues give coaches four landmarks for thinking about volume:^{15Israetel et al., Scientific Principles of Hypertrophy Training, p. 11.}

• Maintenance volume (MV): enough to keep the muscle you have.
• Minimum effective volume (MEV): the least that produces measurable growth.
• Maximum adaptive volume (MAV): the amount that gives the most growth at a given time.
• Maximum recoverable volume (MRV): the most a client can recover from. Past it, growth stops and can go backwards.

Each landmark varies by person and muscle. MEV also rises as a lifter gets more experienced.^{11Israetel et al., Scientific Principles of Hypertrophy Training, p. 61.} In their approach, a training block starts near MEV and adds sets until the client reaches MRV, then backs off. That climb usually takes 3 to 8 weeks, and 4 to 6 for most intermediate and advanced lifters.^{16Israetel et al., Scientific Principles of Hypertrophy Training, p. 153.}

How many sets per muscle per session?

Total weekly work matters more for growth than how often you train a muscle. Frequency has little effect on its own, but it lets you spread the work into manageable sessions.^{17Schoenfeld, Science and Development of Muscle Hypertrophy, 2nd ed., p. 96.}

Evidence points to a ceiling of roughly 10 useful sets per muscle per session, after which extra sets add little. So 20 weekly sets do better as two sessions of 10 than one session of 20.^{17Schoenfeld, Science and Development of Muscle Hypertrophy, 2nd ed., p. 96.} That estimate rests partly on an unpublished simulation, so treat it as a guide rather than a hard limit.^{1Schoenfeld, Science and Development of Muscle Hypertrophy, 2nd ed., p. 93.}

The research suggests these scheduling guidelines:^{18Schoenfeld, Science and Development of Muscle Hypertrophy, 2nd ed., p. 100.}

• At low weekly volumes, frequency barely matters. Pick what fits the client’s schedule.
• Above 10 sets per muscle per week, train that muscle at least twice a week.
• At around 30 sets per muscle per week, spread the work over at least three sessions.

Practitioner sources give similar guidance: about 5 to 10 productive sets per muscle per session, with a clear drop-off past about 15.^{19Israetel et al., Scientific Principles of Hypertrophy Training, p. 215.}

How to adjust a client’s weekly training volume

1. Give a newer client around 10 weekly sets per muscle, split over two or three sessions. Starting near the minimum is more sustainable and carries a lower injury risk. You can add volume when progress stalls.^{8Helms et al., The Muscle & Strength Pyramid: Training, 2nd ed., p. 61.}
2. Teach the client to judge reps in reserve before adding sets. Ten sets stopped well short of failure won’t do what ten hard sets do. Keep most sets 1 to 3 reps short.
3. Progress load and reps first. Lifting more weight for the same sets and reps is already progressive overload.^{20Helms et al., The Muscle & Strength Pyramid: Training, 2nd ed., p. 59.}
4. If progress stalls, check technique, sleep, nutrition and life stress before adding sets. If those are sound, add just 1 or 2 sets per muscle, about a 10% increase in the 10–20 range.^{21Helms et al., The Muscle & Strength Pyramid: Training, 2nd ed., p. 125.}
5. Avoid large jumps in volume or load, which are linked to injury. The NSCA notes that overtraining most often comes from increasing volume too fast.^{22Israetel et al., Scientific Principles of Hypertrophy Training, p. 178.},^{23Schoenfeld and Snarr (eds.), NSCA’s Essentials of Personal Training, 3rd ed., p. 99.}
6. Raise volume gradually over a training cycle, with regular periods of lower volume to aid recovery.^{9Schoenfeld, Science and Development of Muscle Hypertrophy, 2nd ed., p. 89.} See what a deload week is for how to run one.

Coaches disagree on one point. Helms and colleagues keep volume steady and add sets only when a lifter plateaus.^{20Helms et al., The Muscle & Strength Pyramid: Training, 2nd ed., p. 59.} Israetel and colleagues add sets within every block, guided by how quickly the client recovers from soreness and whether they’re hitting their targets.^{24Israetel et al., Scientific Principles of Hypertrophy Training, p. 99.} Both approaches start with low volume and increase it slowly. Keeping sets steady until a plateau is simpler to manage with general-population clients.

How do you know if weekly volume is too high?

One bad session tells you little. At the end of each training block, Helms and colleagues ask five questions:^{25Helms et al., The Muscle & Strength Pyramid: Training, 2nd ed., p. 123.}

• Are they dreading the gym?
• Is their sleep worse than normal?
• Are loads or reps going down?
• Is life stress worse than normal?
• Are aches and pains worse than normal?

Yes to two or more suggests a deload week. If a client needs a deload after only a week or two of training every time, the volume is too high: cut sets by about 20%, for example from 15 to 12.^{21Helms et al., The Muscle & Strength Pyramid: Training, 2nd ed., p. 125.} Israetel and colleagues use a simpler trigger: underperforming two sessions in a row likely means the client has hit their MRV.^{26Israetel et al., Scientific Principles of Hypertrophy Training, p. 156.}

True overtraining is rare in lifters. More often, a client keeps pushing as performance falls, only to get back to where they started a week or two later. Helms and colleagues call this “wheel spinning”.^{27Helms et al., The Muscle & Strength Pyramid: Training, 2nd ed., p. 58.} The NSCA lists more serious warning signs: unexplained underperformance, persistent fatigue, training feeling harder than it should, disturbed sleep and loss of appetite.^{28Haff and Triplett (eds.), Essentials of Strength Training and Conditioning, 4th ed., p. 125.} If symptoms like these persist after training is reduced, refer the client to a doctor rather than adjusting the program further.

Where the evidence runs thin

Use 10–20 sets as a default and adjust based on the client’s progress. Most of the studies behind these numbers used novice trainees; few studied experienced lifters.^{29Helms et al., The Muscle & Strength Pyramid: Training, 2nd ed., p. 86.} Volume studies also tend to measure one or two muscles at a time, so their results don’t carry over neatly to a whole-body program.^{1Schoenfeld, Science and Development of Muscle Hypertrophy, 2nd ed., p. 93.} Nobody yet knows the upper limit for a given person.^{9Schoenfeld, Science and Development of Muscle Hypertrophy, 2nd ed., p. 89.}

Common questions

Do warm-up sets count toward weekly volume?

Light ones don’t. Heavy warm-ups close to working weight do add some stimulus, but there’s no clean line for when they start to count.^{8Helms et al., The Muscle & Strength Pyramid: Training, 2nd ed., p. 61.} Count working sets and keep warm-ups light.

Does every set need to go to failure?

No. Stopping a couple of reps short doesn’t compromise growth with moderately heavy loads.^{30Schoenfeld, Science and Development of Muscle Hypertrophy, 2nd ed., p. 139.} Training to failure all the time raises the risk of overreaching, so save it for the last set of an exercise, and use it more freely on single-joint movements than on big compound lifts.^{7Schoenfeld, Science and Development of Muscle Hypertrophy, 2nd ed., p. 140.}

Should a lagging muscle get more sets?

It can. Higher volumes may help bring up a muscle that’s lagging behind the others.^{1Schoenfeld, Science and Development of Muscle Hypertrophy, 2nd ed., p. 93.} If several muscles lag, raise volume for one at a time across successive training blocks rather than all at once.^{31Schoenfeld, Science and Development of Muscle Hypertrophy, 2nd ed., p. 95.}

Can you build muscle with fewer than 10 sets a week?

Yes, especially early on. Untrained people improve with as little as one set per muscle group per session,^{12Ozemek et al., ACSM’s Guidelines for Exercise Testing and Prescription, 12th ed., p. 359.} and lower-volume programs produce substantial gains in novices and intermediates.^{14Schoenfeld and Snarr (eds.), NSCA’s Essentials of Personal Training, 3rd ed., p. 426.} Ten or more sets tends to produce more growth, so it’s a trade-off with time and recovery.