Counting Hard Sets

A hard set is a working set taken reasonably close to failure (roughly RIR 0–3 — see rpe-rir-logging). Counting hard sets per muscle group per week has become a popular volume-dose unit because it is simpler to prescribe and track than raw training-volume-load, and it maps well to hypertrophy dose-response research.

Practical guidance commonly cited:

• Roughly ~10 sets per muscle per week is a reasonable starting target for growth, with many people benefiting from 10–20+ as they progress.
• A set only "counts" toward a muscle if that muscle was a meaningful driver. A bench press counts for chest; it counts partially (or by convention) for triceps and front delts.
• Junk-volume sets far from failure (high RIR) don't fully count.

For the data layer, this means tagging each exercise with the muscle groups it loads so the system can sum weekly hard sets per muscle and track progression by adding sets over a block (see volume-progression-tracking, progressive-overload-application). Hard-set counts and volume load are complementary: counts are easier to reason about, VL captures load and rep changes a count would miss.

• Hard set = working set near failure (≈ RIR 0–3).
• Dose unit = hard sets per muscle group per week.
• Common starting target ≈ 10 sets/muscle/week; 10–20+ as trained status rises.
• Requires tagging exercises with the muscles they load (primary/secondary).
• Complements volume load; counts are simpler, VL is more granular.

• training-volume-load — the more granular alternative dose metric.
• kpis-hypertrophy — weekly hard sets per muscle is the headline hypertrophy KPI.
• volume-progression-tracking — progression often = adding sets over a block.
• rpe-rir-logging — defines what makes a set "hard".
• progressive-overload-application — consumes set counts to schedule volume increases.