Hypertrophy Evidence Notes
All topics

Volume and Frequency

10–20 sets per muscle per week (count synergist muscles as 0.5 sets). Frequency is a tool for spreading volume.

23Last reviewed Verdicts

Verdicts on this page5
  1. AStrong evidenceMore weekly sets produce more hypertrophy. But each additional set adds less than the one before.
  2. BProbably trueWhen trained lifters push volume past 20 sets, the extra hypertrophy is small. The difficulty, however, clearly goes up.
  3. BProbably trueCounting multi-joint sets as 0.5 sets for the synergist muscles best predicts actual hypertrophy.
  4. AStrong evidenceWith total weekly volume equal, frequency (1, 2, or 3 times a week) has little effect on hypertrophy.
  5. BProbably trueWith volume equated, body-part splits and full-body training produce the same hypertrophy and strength.

Bottom line

  • 10–20 sets per muscle per week. Count only sets taken to within 0–3 reps of failure
  • For multi-joint exercises, count 0.5 sets for the synergist muscles too. For example, one set of bench press counts as 1 for chest, 0.5 for triceps, and 0.5 for front delts
  • Split each muscle across 2 sessions a week, keeping each session to 6–10 sets
  • The split you use (body-part, upper/lower, full-body) does not change hypertrophy. Pick the one you can stick with

Volume: more grows more, but with diminishing returns

AStrong evidence

More weekly sets produce more hypertrophy. But each additional set adds less than the one before.

  • In a meta-regression of 67 studies and 2,058 people, the probability that more volume produces more hypertrophy was 100%. The dose-response follows a square-root curve; around the average of 12 sets per week, each extra set adds about 0.24% to muscle size (Pelland 2026)
  • An earlier meta-analysis also found 10+ sets per week clearly beat fewer than 5 (Schoenfeld 2017)
  • The standard recommendation from a systematic review is 12–20 sets per week. Only the triceps showed a clear benefit beyond 20 sets (Baz-Valle 2022)

In Pelland 2026’s classification, the number of extra sets needed to add one detectable step of growth increases as volume goes up.

Weekly sets (synergists counted as 0.5)EfficiencyExtra sets for the next step
4Minimum effective dose—
5–10HighAbout 6
11–18ModerateAbout 8.5
19–29LowAbout 10.75
30–42LowestAbout 12.5

BProbably true

When trained lifters push volume past 20 sets, the extra hypertrophy is small. The difficulty, however, clearly goes up.

In an RCT in trained lifters (5 years on average) that raised leg volume from about 22 sets by +4–6 sets every 2 weeks, 1RM increased, but differences in muscle size were small or not significant (Enes 2024). A follow-up study found that more sets raised perceived effort and lowered enjoyment (Enes 2026).

Data above 25 sets per week is scarce. Most studies last about 10 weeks, so long-term sustainability and injury risk are unknown.

Counting synergists as 0.5 sets

BProbably true

Counting multi-joint sets as 0.5 sets for the synergist muscles best predicts actual hypertrophy.

Pelland 2026 compared three ways to count synergist sets: as 1, as 0.5, or not at all, and reported that 0.5 fit best. The authors themselves describe it as a modeling heuristic, not a settled standard.

Frequency: twice a week is for spreading volume

AStrong evidence

With total weekly volume equal, frequency (1, 2, or 3 times a week) has little effect on hypertrophy.

  • In a meta-analysis of 25 studies, the effect of frequency was not meaningful once volume was equated (Schoenfeld 2019b)
  • In Pelland 2026, the effect of frequency on hypertrophy was also indistinguishable from zero. For strength, frequency helped up to about twice a week

The real reason for twice a week is that doing 20 sets in one day hurts the quality of the later sets. Split the volume so each session has 6–10 sets.

Training splits

BProbably true

With volume equated, body-part splits and full-body training produce the same hypertrophy and strength.

Meta-analysis of 14 studies and 392 people (Ramos-Campo 2024). If you can only train twice a week, training the whole body each session (the whole upper body in the current program) still hits every muscle twice a week.

References

  1. Pelland JC et al. 2026. The Resistance Training Dose Response: Meta-Regressions Exploring the Effects of Weekly Volume and Frequency on Muscle Hypertrophy and Strength Gains. Sports Med. PMID 41343037 ↩ ↩ ↩ ↩
  2. Schoenfeld BJ, Ogborn D, Krieger JW. 2017. Dose-response relationship between weekly resistance training volume and increases in muscle mass. J Sports Sci. PMID 27433992 ↩
  3. Baz-Valle E et al. 2022. A Systematic Review of The Effects of Different Resistance Training Volumes on Muscle Hypertrophy. J Hum Kinet. PMID 35291645 ↩
  4. Schoenfeld BJ et al. 2019a. Resistance Training Volume Enhances Muscle Hypertrophy but Not Strength in Trained Men. Med Sci Sports Exerc. PMID 30153194
  5. Enes A et al. 2024. Effects of Different Weekly Set Progressions on Muscular Adaptations in Trained Males. Med Sci Sports Exerc. PMID 37796222 ↩
  6. Enes A et al. 2026. Exploring the Dose-Response Relationship Between Resistance Training Volume and Psychophysiological Responses. J Hum Kinet. PMID 42713159 ↩
  7. Schoenfeld BJ, Grgic J, Krieger J. 2019b. How many times per week should a muscle be trained to maximize muscle hypertrophy? J Sports Sci. PMID 30558493 ↩
  8. Ramos-Campo DJ et al. 2024. Efficacy of Split Versus Full-Body Resistance Training on Strength and Muscle Growth. J Strength Cond Res. PMID 38595233 ↩