Muscle coverage with effective sets: how to count which muscles your training reached

Why a stated rule matters

"Sets per muscle group" is one of the most quoted numbers in training and one of the least defined. Does a row count for the back or the biceps? Does a warm-up count? Does a drop set? Two apps can give the same week different totals and both be "right" because neither says what it counted.

Sets are worth counting because the count relates to outcomes. A meta-regression of 15 studies found a graded dose-response between weekly sets and muscle growth, with each additional weekly set associated with a small increase in effect size and higher volumes producing about 3.9 percentage points more gain than lower volumes within the same studies [1]. That is a reason to count sets per muscle carefully, and a reason the rule for counting has to be stated.

Method's approach is to state the rule and keep every number decomposable, so you can see the parts and disagree with the weights if you want to.

The effective sets rule

For each completed working set:

• every primary target muscle on the exercise receives 1 set
• every secondary muscle on the exercise receives 0.5 set
• a muscle listed as both primary and secondary counts once, as primary
• warm-up and drop sets are excluded

Effective sets for a muscle over a window is the sum of primary sets plus half the secondary sets. Method shows the primary count and the secondary count beside the effective total, so nothing is hidden in the arithmetic.

Regions follow the same rule. The six regions are chest, back, shoulders, arms, legs, and core. A set counts once per region among its primary targets and half per region reached only through secondary muscles.

Why warm-ups and drop sets are excluded

A warm-up set is preparation, not a training stimulus in the sense the count is trying to capture. A drop set is performed already fatigued, and counting it as another full set would overstate the work. Both are still logged and visible in the session; they just do not feed this count. The same exclusion applies in Method's estimated 1RM series, so the two views agree on which sets are "working".

Why secondary counts half

Secondary muscles assist. A bench press works the triceps, but not the way a pressdown does. Counting them as a full set would make pressing-heavy weeks look like triceps-heavy weeks; counting them as nothing would hide real work. Half is a convention. It is a stated one, and because the primary and secondary counts are shown separately, you can apply your own weighting if you prefer.

Windows and trends

The display window is 7 days by default, with 28 and 91 days selectable, and custom ranges up to 366 days. The per-muscle trend drawn beside each count covers at least 28 days so it has enough weeks to show anything. The body map shades each muscle relative to your own most worked muscle in the window; it says where your sets went, not whether that was enough.

The taxonomy underneath

Method's exercise library assigns target and secondary muscles from a three-level taxonomy of six regions, 36 canonical muscles, and optional divisions such as the sternal and clavicular heads of the pectoralis major or the upper, middle, and lower fibres of the trapezius. A custom exercise can name a parent muscle to mean "unspecified within the muscle", and it lights every body-map group that carries any of that muscle's divisions. Deep muscles that cannot be drawn on a surface figure, such as the subscapularis and transverse abdominis, are listed in text.

What the count does not say

It does not say whether a muscle is undertrained or overtrained, whether the week was balanced, or what to do next. It states where your completed working sets went under a rule you can read. That is the whole claim, and it is enough to make two weeks comparable.

Sets from exercises with no muscle data are shown separately as not counted, rather than being assigned to full body or dropped. Fix the exercise's muscles in the library and the count updates.