What the research shows
A 2017 meta-analysis by Schoenfeld, Ogborn and Krieger found a dose-response relationship: more weekly sets produced more muscle growth, with 10 or more sets per muscle per week clearly ahead of fewer than 5. Some later studies have gone higher still in trained lifters, but the extra gains shrink as volume rises, while the time and fatigue do not.
In practice the curve flattens. Going from 4 to 10 sets matters a lot; going from 20 to 30 matters far less, and not everyone recovers from it.
What counts as a set
- A working set taken to within about 1 to 3 reps of failure.
- Not warm-up sets: they are too light to be a meaningful stimulus.
- Compound lifts count for more than one muscle. A bench press trains the chest, but also the front of the shoulders and the triceps. A common shortcut counts it as a full set for the chest and half a set for each helper.
- Sets in different rep ranges count the same, as long as they are hard.
Where to start, and when to change
Start near the bottom: around 10 sets per muscle per week, or fewer if you are new to training. Run it for four to six weeks and look at your log. If your lifts are climbing and you recover between sessions, there is no reason to add anything.
If progress stalls while recovery is fine, add two to four sets for the muscle that lags. If you are constantly sore, sleeping badly or your lifts are going backwards, the answer is fewer sets, not more.
Spread it across the week
Twenty sets for one muscle in a single session are mostly tired sets by the end. Splitting a muscle’s weekly volume over two or more sessions keeps each set higher quality, which is one reason most effective programmes train each muscle at least twice a week.
PushBeyond’s muscle map shows which muscle groups you train most and which you neglect, so a lagging muscle becomes visible before it becomes a habit.