Volume: How Many Sets per Muscle per Week
Introduction
It's probably the highest-impact variable you get to decide, and the one most people manage by feel. Almost nobody knows how many weekly sets they do per muscle group, and that figure explains much of why they progress or don't.
The good news is that there's a fairly clear relationship between volume and result, and you can calculate your current number in ten minutes.
Before asking which routine to follow, count how many sets reach each muscle. It's usually far fewer than you think.
The dose-response relationship
Schoenfeld and colleagues' meta-analysis is the usual reference: it grouped studies by weekly sets per muscle group and found more hypertrophy with more volume, in a clear gradation.
- Fewer than 5 weekly sets: real but smaller gains.
- Between 5 and 9: better.
- 10 or more: the largest in the analysed set.
For strength the relationship exists and is flatter: you can gain considerable strength at lower volumes, because intensity and practising the movement weigh more there.
Two caveats worth holding. First, most of those studies run six to twelve weeks, which is short. Second, the upper end is poorly defined: some work with very high volumes shows benefit and some doesn't, and samples are small. That more is better within the studied range doesn't mean it continues indefinitely.
The numbers you can use
With those reservations, the practical ranges in use today:
To maintain: around 4 to 6 weekly sets per muscle group suffice to preserve what you've gained. It's a surprisingly low number and very useful when time is short.
To progress: between 10 and 20 weekly sets per group is where most people who progress well live.
Reasonable starting point: 10 weekly sets per group. Go up from there if you recover.
For an intermediate trainee doing three full-body days, that means 3 or 4 sets per group per session. It isn't much per session; it accumulates across the week.
How to count
There's a source of confusion here worth resolving.
Count effective sets, meaning those taken reasonably close to failure. A warm-up set doesn't count.
Indirect work counts as half. In a row, the back does the main work and the biceps participates. The usual convention is to count the full set for the primary muscle and half for the secondary. It isn't exact and it stops you fooling yourself in either direction.
Count by group, not by exercise. Three chest exercises of 3 sets are 9 chest sets, not three separate blocks.
Do the calculation with your current routine. It's common to discover one group gets 18 sets and another gets 4.
When to increase and when not to
Volume isn't increased for its own sake: it's increased when there are signs you tolerate it.
Add 2 to 4 weekly sets per group, per block, if three conditions hold: you're progressing in load or reps, you recover between sessions, and you aren't accumulating joint niggles.
Don't increase if performance is falling, if you're sleeping badly, if you're in an aggressive calorie deficit or if you're coming off patchy weeks. In those cases the problem isn't the dose.
And there's a practical limit that matters more than the physiological one: the volume you can recover from is the volume you can use. Sets that leave you unable to perform in the next session don't add, they subtract.
Junk volume
There's a real phenomenon worth naming: sets that get done, cost time and provide no stimulus. They appear for two main reasons.
Sets too far from failure. Finishing with five reps in reserve produces little adaptation, and those sets still add fatigue and time.
Accumulation by inertia. Exercises in the routine because they were always there, with nobody checking whether the group already gets enough elsewhere.
Before increasing volume, check that what you already do is effective. There's usually more margin there than in adding.
Common mistakes
Not counting. The base error: without the number there's no decision, only intuition.
Raising volume and lowering intensity at once. You change two variables and won't know which acted.
Distributing badly between groups. Chest and biceps at 20 sets with back at 6 is the classic pattern of programming by preference.
Raising volume to escape a plateau without auditing. If the cause was fatigue or adherence, it makes things worse.
Copying an advanced trainee's volume. Tolerance is built over years; starting where someone else finished is the fast route to injury.
Conclusion
Volume is the highest-impact variable you can adjust, and almost nobody knows where they stand on it. The range where progressing people live is wide — 10 to 20 weekly sets per group — and maintaining takes far less.
Do the calculation today with your routine in front of you: add up the weekly effective sets for each muscle group. You'll find at least one group well below and probably another inflated. Fixing that imbalance pays more than any change of program.
References
- 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).
- Baz-Valle, E., et al. (2022). A systematic review of the effects of different resistance training volumes on muscle hypertrophy. Journal of Human Kinetics, 81.
- Ralston, G. W., et al. (2017). The effect of weekly set volume on strength gain: A meta-analysis. Sports Medicine, 47(12).
- Bickel, C. S., Cross, J. M., & Bamman, M. M. (2011). Exercise dosing to retain resistance training adaptations in young and older adults. Medicine & Science in Sports & Exercise, 43(7).
- Refalo, M. C., et al. (2023). Influence of resistance training proximity-to-failure on skeletal muscle hypertrophy. Sports Medicine, 53(3).