In this guide
If you've ever stalled in the gym, you've probably been told the same thing: do more. More sets, more days, more volume. It's the most common advice in strength training, and it has real evidence behind it, up to a point. The awkward question is where that point is. How many weekly sets can a trained lifter do before extra work stops helping, or starts to cost you?
A study published in July in the Journal of Science in Sport and Exercise went looking for the ceiling. Researchers at the University of Jyväskylä in Finland had national-level athletes push a leg-training volume up to 63 sets a week, higher than any long-term trial had tried before. The result wasn't what the "more is better" crowd would hope. We read the full open-access paper, including its limitations, and put it next to an October systematic review that points the same way.
The short version: in 27 strength-trained male athletes, the biggest gains in muscle thickness and strength came during the first 10 weeks at roughly 32–41 weekly sets. A further 7 weeks at about 1.5 times the volume (up to 63 sets) produced no significant extra muscle growth or strength, and deadlift gains were actually slightly larger in the group that did less. Extra volume also didn't turn "non-responders" into responders. It's a small study with limits, but it fits a broader pattern: after a point, more sets mainly add fatigue.
The "More Is Better" Belief That Runs Most Training Programmes
There's a good reason for the belief. A well-known 2017 meta-analysis by Schoenfeld and colleagues found a dose-response relationship between weekly sets and muscle growth: more sets, more hypertrophy, at least across the studied range. More recent meta-regression work, published in Sports Medicine in 2026 by Pelland and colleagues, suggested continued gains up to about 43 weekly sets per muscle with no clear plateau, estimating roughly a 0.24% increase in growth for each additional weekly set, though evidence above 31 sets was thin and diminishing returns were suspected.
So the logic seems sound: if more is better up to 43 sets, why not 60? That was the exact question the Finnish team set out to answer, in athletes who were already training hard.
The Finnish Study at a Glance
| Item | Details |
|---|---|
| Title | Exploring the Upper Limits of Resistance Training Volume for Muscle Hypertrophy and Strength in Trained Athletes |
| Journal and date | Journal of Science in Sport and Exercise, open access, 13 July 2026 (Räntilä & Ahtiainen; doi:10.1007/s42978-026-00387-7) |
| Where | Faculty of Sport and Health Sciences, University of Jyväskylä, Finland |
| Participants | 27 male strength-trained athletes (mean age about 24; national-level track-and-field and floorball athletes; at least 3 years of resistance training); 32 recruited, 5 withdrew with musculoskeletal problems |
| Design | 10 weeks of progressive leg training for everyone, then a 7-week phase split into a "normal" volume group (n = 12) and an "extra" volume group (n = 15) doing about 1.5 times the weekly sets |
| Volume | Weeks 1–10: about 32–41 weekly sets; extra group rose to about 58–63 sets per week |
| Measured | Ultrasound muscle thickness (vastus lateralis and biceps femoris), back squat, deadlift, isometric squat, broad jump and peak power |
| Funding | Finnish Athletics Foundation and the Emil Aaltonen Foundation; authors report no competing interests |
How the Study Was Run
The design is neat. Everyone first completed the same 10-week programme built around the back squat and deadlift plus accessory movements, with a controlled tempo and set rest periods (four minutes for the main lifts, 90 seconds for accessories). Volume was progressed and deliberately dropped in weeks 5, 10 and 17 to aid recovery. Participants did no other strength training, but they kept up their normal sport practice.
After week 10, they were paired by how much their thigh muscle had grown and randomly assigned within pairs to continue as before or to increase weekly sets by about half. That clever pairing meant the two groups started the experimental phase with similar responses. When there was an odd number of participants, the extra person went into the higher-volume group. The researchers weren't blinded to group assignment, which they acknowledge.
What Happened When Volume Went Up
The first 10 weeks worked well. Thigh muscle thickness in the vastus lateralis rose by about 7% at the mid-point, back squat strength improved by about 19% and deadlift by about 12.5%, all at weekly volumes of roughly 32–41 sets. That's a lot of progress in athletes who were already strong.
Then came the experiment. Over the final 7 weeks, the extra-volume group's vastus lateralis grew by about 2.1% compared with about 0.6% in the normal group, but that gap was not statistically significant, and the individual variability was large. Back squat gains were virtually identical (about 5.8% versus 5.7%). Deadlift favoured the lower-volume group (about 6.3% versus 4.3%, p = 0.043). Isometric squat strength showed a small, non-significant tilt toward the lower-volume group.
The authors' conclusion is plain: substantially increasing volume didn't improve hypertrophy or strength, and the greatest gains in the whole study came in the first phase.
The "Non-Responder" Question
One of the study's most interesting angles is about people who don't seem to grow. After the first 10 weeks, the researchers used a conservative threshold, a change greater than twice the measurement's typical error, to classify who had genuinely responded. Thirteen athletes did; fourteen did not. Ten of those fourteen non-responders ended up in the extra-volume group.
If low volume had been the problem, adding sets should have helped. It didn't. During the extra phase, non-responders' thigh thickness rose by about 3.8% in the normal group and 3.2% in the extra group, essentially no difference. The authors concluded that, in athletes already training at high volumes, insufficient volume is an unlikely explanation for non-response, and that excessively demanding overall training loads may constrain hypertrophy in some people.
A sober caveat belongs here. "Non-response" is partly a measurement artefact. The ultrasound measurement of the thigh muscle was quite reliable (typical error about 0.08 cm), but measures of the hamstring muscle were much noisier. Labels like "non-responder" can describe a real biological pattern or simply noise at a single site and time point, so don't take the label personally.
Why More Didn't Help: Fatigue, Recovery and Sport Load
The authors offer a few explanations. They're hypotheses, not findings, but they match what coaches see:
- Accumulated fatigue. Acute fatigue within a set drives growth by recruiting more muscle fibres, but chronic fatigue across weeks can blunt adaptation if recovery isn't enough.
- Athletes weren't only lifters. Participants also did sport practice, running and jumping, which the study didn't control. The total demand on their bodies was much more than set counts suggest.
- Volume and intensity rose together. Progressing both at once for long periods may simply be too much; the authors suggest prioritising one at a time.
- Diminishing returns are real. Beyond a point, each extra set adds more fatigue than stimulus.
Five of the original 32 participants dropped out because of musculoskeletal problems during the programme. That's a reminder that very high volumes carry a practical cost, not only a statistical one.
How It Fits With the Larger Evidence
No single study overturns a meta-analysis, and this one doesn't. It adds to a picture in which more volume helps up to a point, and that point is likely lower than people assume for trained lifters. Earlier studies have reported growth with up to about 50 weekly sets in trained men and progressions up to about 52 sets, yet gains per extra set shrink as volume climbs. The Finnish team suggests the practical optimum for hypertrophy in trained athletes may lie around 9–15 weekly sets per muscle for major movements, and that the appropriate volume overall may be less than about 58 sets a week.
It also connects with research in other groups. A network meta-analysis of 151 randomised trials in older adults found that low volumes improved physical function and lean mass substantially, with higher volumes needed mainly for greater strength gains. And a 2024 study found that older adults who didn't respond at two weekly sets did grow at eight, a reminder that "more" helps at the low end and fades at the high end. In effect, the dose-response curve rises steeply, flattens, and may bend downward.
The Limits You Should Know About
- Small, specific sample. Twenty-seven young male athletes, mostly from two sports. Women, older adults and recreational lifters may differ.
- Low statistical power for small differences. The authors acknowledge a type II error (a false negative) can't be ruled out. A small advantage for extra volume could be hidden.
- Seven weeks is short. Longer periods at high volume might show something different, including more injuries or more recovery needs.
- Diet wasn't controlled. Energy and protein intake can change how well people tolerate and benefit from volume.
- Only set count was manipulated. Not load, exercise selection or proximity to failure, all of which also shape growth.
- Single-site ultrasound. It measures thickness at one point on one muscle; other regions or muscles might respond differently.
- Researchers weren't blinded, and allocation wasn't perfectly random when numbers were odd.
What the October Review Says Really Drives Growth
A systematic review published this month in the Journal of Bodywork and Movement Therapies asked a related question: among the many training variables lifters obsess over, which are most consistently linked to hypertrophy in resistance-trained people? Its conclusion was that training volume load, the combined product of sets, reps and weight, is the variable most consistently associated with muscle growth. Variables such as repetition range, rest interval, range of motion, external load and set configuration appeared to exert comparatively smaller influence when volume and effort were adequately matched.
Put the two papers side by side and a useful picture emerges. Volume load matters, so progressive overload is the engine. But more of it isn't unlimited, so there's a sweet spot beyond which extra work stops paying. Everything else, tempo, rep ranges, rest times, is mostly tuning around that core.
A Practical Volume Ladder for Lifters
These ranges are a synthesis of the research above and common coaching practice, not rules. Always take sets close to failure, around 0–3 reps from it, because far-from-failure sets count for less.
| Level | Weekly hard sets per muscle group | Notes |
|---|---|---|
| Time-poor or maintenance | About 4–6 | Holds muscle and builds a little; see our minimum-effective-volume research |
| Beginner (first year) | About 6–10 | Rapid gains come easily; more isn't needed |
| Intermediate | About 10–15 | The range many trials and coaches find productive |
| Advanced, specialising a lagging muscle | About 15–20, sometimes briefly more | Only if recovery, sleep and food are in order; use for short blocks |
| Above ~25 per muscle | Rarely needed | Evidence of extra benefit is weak; fatigue and injury risk rise |
To track progress without guesswork, estimate strength trends with the one rep max calculator, and check body composition now and then with the body fat calculator. For a full framework, see our natural muscle-building guide.
What to Do When Progress Stalls (Before Adding Sets)
Given everything above, the instinct to add sets should be the last move, not the first. Work through this list in order.
- Check effort. Are your hard sets truly hard? Many "stalls" come from sets that end five reps from failure.
- Check progression. Are you adding reps or weight over time? Without progressive overload, volume is just activity.
- Check recovery. Sleep 7–9 hours, manage stress, and note how much sport or physical work you do outside the gym. The Finnish athletes' extra load came from everywhere, not just lifting.
- Check food. Training harder raises energy needs; confirm maintenance with the TDEE calculator, and aim for about 1.6–2.2 g/kg of protein using the protein intake calculator. For a bulk, our bulking calorie guide and lean-bulk plan show how big a surplus makes sense.
- Change the stimulus, not just the amount. Swap an exercise, change the rep range, or alter the muscle length at which you train. Variety can reignite progress without adding fatigue.
- Progress one thing at a time. Raise either load or sets in a block, not both, as the authors suggest.
- Only then add sets, modestly. Add 1–2 hard sets per muscle per week, hold for 3–4 weeks, and see what your strength and measurements do.
- Schedule a lighter week. Planned reductions, like the Finnish programme's deliberate dips, help fatigue clear.
Our guide to protein sources will help with the food side, and the programming tips above work whether you're building, cutting or maintaining.
The Bottom Line
The Finnish study is a careful, honest test of a question the fitness world mostly answers with confidence instead of data. In strong, trained young men, pushing leg-training volume to about 60 sets a week produced no meaningful extra growth or strength compared with a lower-volume group, and it didn't rescue the "non-responders". Combined with the broader literature, and with an October review pointing to volume load, not rep ranges or rest times, as the main driver of hypertrophy, it supports a calm message: there's a productive zone, and beyond it more work mostly adds fatigue.
For you, that means two things. Don't be afraid of moderate volumes, because 10–15 hard sets per muscle a week works for most lifters. And when progress stalls, treat extra sets as a late option, after effort, progression, recovery and food are in order. The best programme isn't the biggest one you can survive. It's the smallest one that keeps you progressing.
Frequently Asked Questions
How many sets per week are too many for muscle growth?
There's no single number, but a 2026 Finnish study found no extra growth in trained male athletes when leg-training volume rose from roughly 40 to about 60 sets a week. Meta-analyses suggest gains may continue to about 43 sets with diminishing returns, but most lifters grow well on 10–15 hard sets per muscle per week.
Does more training volume always build more muscle?
No. More volume tends to help at lower ranges, but benefits flatten and may reverse when recovery is exceeded. In the Finnish study, 1.5 times the volume produced no significant extra hypertrophy, and deadlift gains were slightly larger with less volume.
Can more sets fix being a "non-responder"?
In this study, no. Among athletes who didn't show clear early growth, adding volume didn't change their response. It's also worth remembering that "non-response" can partly reflect measurement noise, and other factors such as recovery, food and total training load may matter more.
What is the best number of sets per muscle per week?
For most intermediate lifters, about 10–15 hard sets per muscle group per week is a productive range. Beginners often do well on 6–10, and advanced lifters may use 15–20 temporarily for lagging areas.
What matters most for muscle growth besides sets?
A systematic review published in October 2026 concluded that training volume load is the variable most consistently associated with hypertrophy in resistance-trained people, with rep range, rest interval, range of motion and load having smaller effects when volume and effort are matched. Protein, calories and sleep are also essential.
Should I train every muscle with the same volume?
Not necessarily. Smaller or "stubborn" muscles may need more direct sets, while muscles that get lots of indirect work, such as triceps from pressing, may need fewer. Adjust by response.
Is it better to increase weight or sets?
The Finnish authors suggest prioritising progression of either volume or intensity at a given time rather than both at once, especially when training time and recovery are limited.
Does this apply to women or older adults?
The study used young male athletes, so caution is warranted. Other research in older adults shows low volumes can improve function and lean mass substantially, with more volume needed mainly for bigger strength gains.
How do I know if I'm overdoing it?
Warning signs include persistent fatigue, declining performance on key lifts, poor sleep, nagging joint or tendon pain and loss of motivation. If several appear, reduce volume or take a lighter week before adding anything.
References & Sources
- Räntilä, A. & Ahtiainen, J. P. (2026). Exploring the upper limits of resistance training volume for muscle hypertrophy and strength in trained athletes. Journal of Science in Sport and Exercise. doi:10.1007/s42978-026-00387-7.
- Effects of resistance training variables on muscle hypertrophy in resistance-trained individuals: a systematic review (October 2026). Journal of Bodywork and Movement Therapies.
- Pelland, J. C., Remmert, J. F., Robinson, Z. P., Hinson, S. R. & Zourdos, M. C. (2026). The resistance training dose response: meta-regressions exploring the effects of weekly volume and frequency on muscle hypertrophy and strength gains. Sports Medicine, 56, 481–505.
- Schoenfeld, B. J., Ogborn, D. & Krieger, J. W. (2017). Dose-response relationship between weekly resistance training volume and increases in muscle mass: a systematic review and meta-analysis. Journal of Sports Sciences, 35(11), 1073–1082.
- Enes, A., de Souza, E. O. & Souza, T. P. (2024). Effects of different weekly set progressions on muscular adaptations in trained males: is there a dose-response effect? Medicine & Science in Sports & Exercise, 56(3), 553–563.
- Lixandrão, M. E. et al. (2024). Higher resistance training volume offsets muscle hypertrophy nonresponsiveness in older individuals. Journal of Applied Physiology, 136(2), 421–429.
- Effects of resistance training volume on physical function, lean body mass and lower-body muscle hypertrophy and strength in older adults: a systematic review and network meta-analysis of 151 randomised trials (2024). Sports Medicine.
- MacrosMeasure (2026). Free One Rep Max Calculator.
- MacrosMeasure (2026). Free Protein Intake Calculator.
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