Sets, reps and effort: how much training you need
Weekly sets, rep ranges, effort and rest are the dials of any programme. Here is what the research says about each one, and where it is still unclear.
Every programme is built from the same few dials: how many sets you do, how many reps per set, how hard each set is, and how long you rest. The research on each has moved on a lot in the last decade. The short version: hard sets are what count, a fairly wide range of reps works, and you do not need to grind every set to failure.
Weekly sets per muscle
Volume is usually counted as hard sets per muscle per week. The 2026 American College of Sports Medicine (ACSM) position stand suggests aiming for about 10 sets per muscle group per week if muscle size is your goal [1].
A large recent meta-regression of 67 studies and 2,058 people found that muscle growth kept rising as weekly sets went up, with diminishing returns [2]. In plain terms:
- A small dose already works. The authors estimated a minimum effective dose of about 4 weekly sets for muscle growth [2].
- More sets usually add a bit more growth, but each extra set adds less than the one before [2].
- They did not find a clear ceiling for growth within the range studied, but strength levelled off much sooner: for strength, returns fell away quickly as volume rose [2].
The study counted sets that only work a muscle indirectly (for example, triceps on a bench press) as half a set, which predicted results better than counting them as a full set or zero [2]. That is a useful rule of thumb for planning.
A practical approach: start around 10 hard sets per muscle per week, then add sets slowly if you are recovering well and progress has stalled. Recovery, time and joint comfort set your real upper limit.
Rep ranges: muscle versus strength
| Goal | What the evidence supports |
|---|---|
| Muscle size | A wide range works if sets are hard. Heavy (about 6 to 11 reps) and light (about 18 to 34 reps) loads gave similar growth when taken to failure [3]. |
| Strength | Heavier loads win. Loads above 60% of 1RM gave larger strength gains than lighter loads [3]. The 2026 ACSM stand suggests loads of 80% of 1RM or more and 2 to 3 sets per exercise [1]. |
The 2009 ACSM position stand recommends loads in the 1 to 12 rep range for muscle size, with most work in the 6 to 12 rep zone [4]. That middle zone is still a sensible default: heavy enough to build strength, light enough to rack up quality sets without beating up your joints. Very high reps work for growth but can be unpleasant and hard to judge near failure.
If strength on a specific lift matters to you, include some heavier work on that lift [3].
How close to failure?
Effort is often rated with reps in reserve (RIR): how many more reps you could have done. RIR 0 is failure, RIR 1 means one rep left, and so on. It maps onto a 1 to 10 RPE scale, where RPE 10 equals RIR 0 and RPE 9 equals RIR 1 [5].
What the evidence shows:
- A 2023 meta-analysis found no clear advantage for training to failure over stopping short, for muscle growth [6].
- A 2024 meta-regression suggested growth tends to improve as sets get closer to failure, while strength gains were similar across a wide range of RIR [7]. The authors note that RIR in these studies was estimated, so the exact relationship is still unclear [7].
- The 2026 ACSM stand concluded that training to failure did not consistently change results for the average healthy adult [1].
Putting this together: keeping most working sets within a few reps of failure is a reasonable target for size. Taking every set to true failure is not needed and adds fatigue. Save failure for safer exercises like machines, cables and isolation work, and stop a rep or two short on heavy squats, deadlifts and presses where a failed rep is risky. People new to training often underestimate how many reps they have left, so it is worth testing yourself on a safe exercise now and then.
Rest between sets
| Situation | Evidence-based rest |
|---|---|
| Muscle size | More than 60 seconds gave a small advantage; going beyond 90 seconds added little more [8]. |
| Heavy compound lifts | At least 2 to 3 minutes [4]. |
| Assistance exercises | 1 to 2 minutes may be enough [4]. |
Short rest cuts the reps you can do on later sets, which lowers the total work you get in [8]. A simple rule: rest long enough that you can hit your target reps on the next set. Take longer on big lifts. If you are short of time, cut rest on isolation work first.
Bringing it together
- Count hard sets per muscle per week. Start near 10.
- Use mostly 6 to 12 reps, with heavier work if strength is a goal.
- Keep most sets within a few reps of failure.
- Rest enough to keep the next set productive.
- Add volume slowly, and only if recovery allows.
Then apply progressive overload and spread the sets over the week with a training split that fits your life. If you get joint pain that does not settle, see lifting injuries.
Tracking it in ETS
ETS logs sets, reps and kg for every exercise, so you can count your weekly hard sets and see your estimated 1RM change over time. Effort isn't logged as a separate number, so keep your target in mind and use your reps at a given weight to judge whether sets are getting easier. The built-in rest timer helps you keep rests consistent from session to session.
Sources
- American College of Sports Medicine. Resistance training prescription for muscle function, hypertrophy, and physical performance in healthy adults: an overview of reviews (position stand). Medicine & Science in Sports & Exercise, 2026. ACSM infographic (PDF)
- Pelland JC, Remmert JF, Robinson ZP, Hinson SR, Zourdos MC. The resistance training dose response: meta-regressions exploring the effects of weekly volume and frequency on muscle hypertrophy and strength gains. Sports Medicine, 2026. Springer
- Schoenfeld BJ, Grgic J, Ogborn D, Krieger JW. Strength and hypertrophy adaptations between low- vs. high-load resistance training: a systematic review and meta-analysis. Journal of Strength and Conditioning Research, 2017. Victoria University repository
- Ratamess NA, Alvar BA, Evetoch TK, et al. American College of Sports Medicine position stand: Progression models in resistance training for healthy adults. Medicine & Science in Sports & Exercise, 2009. Full text (PDF)
- Helms ER, Cronin J, Storey A, Zourdos MC. Application of the repetitions in reserve-based rating of perceived exertion scale for resistance training. Strength and Conditioning Journal, 2016. AUT repository
- Refalo MC, Helms ER, Trexler ET, Hamilton DL, Fyfe JJ. Influence of resistance training proximity-to-failure on skeletal muscle hypertrophy: a systematic review with meta-analysis. Sports Medicine, 2023. AUT repository
- Robinson ZP, et al. Exploring the dose-response relationship between estimated resistance training proximity to failure, strength gain, and muscle hypertrophy: a series of meta-regressions. Sports Medicine, 2024. Springer
- Singer A, Wolf M, Generoso L, et al. Give it a rest: a systematic review with Bayesian meta-analysis on the effect of inter-set rest interval duration on muscle hypertrophy. Frontiers in Sports and Active Living, 2024. Frontiers
More on training
Last reviewed 7 October 2026. General information, not medical advice. Found a mistake? Email [email protected].