Afitpilot®
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Volume & Work

Sets

Also known as: Working Sets, Training Sets

A set is one continuous bout of exercise — the number of times you perform a group of consecutive reps before resting. Sets are the fundamental building block of every workout prescription.

Formula

No formula — sets are prescribed directly (e.g. "4 sets of 8 reps") and logged as performed.

Example

4 sets of bench press means you perform the exercise 4 separate times with rest between each.

How Afitpilot Uses This

Sets drive RPE weighting — when computing session-level RPE, each exercise's RPE is weighted by its set count. An exercise with 5 sets contributes more to session effort than one with 2 sets. Sets also multiply into volume (sets x reps) and tonnage (sets x reps x weight).

Weekly sets per muscle group — what works

Who / ContextValueNote
Hypertrophy sweet spot10-20 hard sets/muscle/weekBelow 10 = maintenance; above 20 = diminishing returns
Powerlifter12-18 sets/sessionFewer sets, very high intensity per set
Active aging (60+)2-3 sets per exerciseDiminishing returns beyond 3 sets; injury risk rises
Hybrid athleteCount running as "leg sets"Intervals = high-rep, low-load leg work

Known Limitations

  • •We don't currently distinguish between "working sets" and warm-up sets. All prescribed sets are treated equally in calculations. Warm-up and cooldown blocks are excluded at the block level, but warm-up sets within a working block are not separated.
  • •Drop sets, cluster sets, myo-reps, and rest-pause sets are all counted as single sets despite involving very different fatigue profiles.

What We're Improving

  • Future

    Effective Sets (Hard Sets) Tracking

    Track sets taken within 0-3 RIR of failure separately from total sets. Research increasingly suggests that "hard sets" are a better predictor of hypertrophy stimulus than total volume. This would give a more nuanced view of training dose.

  • Future

    Per-Muscle-Group Weekly Volume

    Aggregate weekly set volume by muscle group using our exercise library classifications. This would let us flag under- or over-trained muscle groups relative to evidence-based guidelines (10-20 sets/week).

Science Context

Weekly set volume per muscle group is one of the strongest predictors of hypertrophy in the literature (Schoenfeld et al., 2017). Current evidence suggests 10-20 sets per muscle group per week for most trained individuals, though individual variation is large.