Weekly Sets per Muscle

What it is. Weekly volume for hypertrophy is counted as hard sets per muscle group per week. A hard set ends close to failure, roughly within 0–3 reps in reserve (see Counting Hard Sets). Warm-up sets and easy sets don't count.

Why it matters. Volume is one of the few program variables with a reliable effect on growth. The 2026 ACSM Position Stand found that ≥10 sets per muscle group per week produced more hypertrophy than lower volumes. It also found two sets per exercise better than one, though the exact best number "cannot be ascertained". Earlier, Schoenfeld, Ogborn and Krieger (2017) showed a graded dose-response: each extra weekly set was associated with about 0.37% more growth.

More is better, then less so. Pelland et al. (2025; 67 studies, 2,058 participants) confirmed that size and strength both rise with weekly volume, but with diminishing returns, which are much sharper for strength than for size. ACSM's reading of that analysis puts the hypertrophy plateau around ~18–20 weekly sets, and the strength plateau around 2–3 sets per exercise. Past your own recoverable ceiling, extra sets cost more fatigue than they return (the MRV idea).

Counting compounds. A row trains the back directly but also works the biceps. Pelland's best-fitting model counted those indirect sets as half a set ("fractional" counting). So 4 sets of rows = 4 back sets + 2 biceps sets.

Spreading the sets. When weekly volume is equal, ACSM found no difference in growth between training a muscle 1 day vs more than 5 days a week. Splitting 16 sets into 2 sessions of 8 is mainly practical: fresher sets, shorter sessions. Frequency matters more for strength (see Training Frequency Considerations).

Maintenance needs much less. In younger adults, strength and muscle size were maintained for up to 32 weeks with as little as 1 session per week and 1 set per exercise, as long as the load (intensity) stayed the same. Older adults may need 2 sessions a week and 2–3 sets per exercise (Spiering et al. 2021).

• Beginners: start at about 10 hard sets per major muscle per week. You will grow on that, and it leaves room to add volume later.
• Intermediate and advanced lifters: work in the ~10–20 range. Add sets to a lagging muscle only when progress there has stalled and recovery is good.
• Busy periods, injury elsewhere, or a cut: drop toward maintenance volume and keep the loads heavy.

• These are group averages from trials lasting weeks to months, mostly in young men. Your own productive range is individual and differs by muscle.
• Set counts assume genuinely hard sets. Ten easy sets are not ten hard sets.
• The ~18–20 plateau is where average returns flatten. It is not a target to jump to, and it isn't a hard ceiling for everyone.
• Strength responds more to load and frequency than to piling on sets (see Principle of Progressive Overload).

Chris trains upper/lower 4× per week and wants bigger arms and back. His current week:

Back sits at 10 and is fine. Biceps get 8 counted sets, mostly from rowing. If his arms are the priority, adding 2–3 direct curl sets (e.g., Incline Dumbbell Curl) takes biceps past 10 without touching anything else. Demo clips for every exercise named here are in the Fysiqal media library.

Next lesson: Double Progression. You know how many sets to do; now learn how to make each one a little harder over time.

• Count hard sets (≈0–3 RIR) per muscle per week; indirect sets ≈ ½.
• ≥10 sets/muscle/week beats lower volumes (ACSM 2026).
• Returns diminish; ACSM reads the hypertrophy plateau at ~18–20 weekly sets.
• Frequency doesn't change growth when weekly volume is equal (1 vs >5 days).
• Maintenance: ~1 session and 1 set per exercise per week at maintained load (younger adults); older adults ~2 sessions, 2–3 sets.