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Sets, reps and how much weight to actually lift

By Chris Mann Dip.IOPN, Sports nutritionist and personal trainerChecked against published guidance 6 min read

Almost every beginner asks the same three questions in the first week: how many sets, how many reps, and how heavy. The answers are simpler than the internet suggests — and the part that matters most is knowing when to add weight.

Two words first, in case they are new: a rep is one complete repetition of an exercise, and a set is a group of reps you do before you rest.

Before you start

This is general fitness and nutrition guidance for healthy adults aged 18 and over, not medical advice. Speak to a health professional first if you are pregnant or recently gave birth, recovering from surgery, injury or illness, taking medication, living with a heart, lung, metabolic or joint condition, or have a history of disordered eating.

In short

As a beginner, do 2 to 4 sets of 8 to 12 reps on each main exercise, resting 90 seconds or so between sets. Choose a weight you could lift for about two more reps than you plan to do, and add the smallest available increment once every set of that exercise feels controlled.

  • 8 to 12 reps is a practical starting range rather than the only one that works — it builds strength and muscle while you are still learning the movement.
  • Reps in reserve is the honest gauge: finish sets with 1 to 2 reps left, not at failure.
  • Two easy weeks first. Load added on top of shaky technique is what causes setbacks.
  • Add 1 to 2.5 kg upper body, 2.5 to 5 kg lower body, then rebuild your reps.

Sets and reps by goal

GoalSetsRepsEffort
Learning a new movementTechnique is the goal. Repetition teaches the pattern faster than weight does.2–38–12Very light, 4 reps in reserve
Building muscleThe classic beginner range: enough load to matter, light enough to control.38–121–3 reps in reserve
Building strengthWorth adding to the main squat, hinge or press after two or three months.3–44–62–3 reps in reserve
Trunk and small isolation workKeep these short. They support the main lifts rather than replacing them.210–15 or 20–40 secondsBodyweight or light

Finding your first working weight

  1. 1. Start with the lightest available option and do 5 easy reps to feel the movement.
  2. 2. Add a small increment and do 5 more. Repeat until the reps feel like real work but stay smooth.
  3. 3. Take about 10 per cent off that weight for your first working set — beginners consistently overshoot.
  4. 4. Write the number down. Your next session starts from that record, not from guesswork.

Judging effort with reps in reserve

4 reps in reserve
Comfortable. You could clearly keep going. Use it for: Week one and every warm-up set.
2–3 reps in reserve
The last rep slows down slightly but stays smooth. Use it for: Most of your working sets.
1 rep in reserve
Hard. The final rep is a genuine effort. Use it for: The last set of a main movement, occasionally.
0 reps in reserve
Failure — the rep does not finish. Use it for: Rarely needed, and never on free-weight lifts without a spotter.

To see these numbers inside a full week of training, read beginner gym workout plan.

When to add weight

  1. Add weight when you hit the top of the range on every set

    If the plan says 8–12 reps and you completed 12, 12 and 12 with 1–2 reps in reserve, add the smallest increment next session: 1–2.5 kg upper body, 2.5–5 kg lower body.

  2. Rebuild reps after every increase

    The new weight will drop you back towards 8 reps. That is correct. Work back up the range over the following weeks.

  3. Repeat the session when reps stall once

    One flat session is normal — sleep, stress and food all move performance. Repeat the same weight before deciding anything.

  4. Reduce load by 10 per cent after three stalled sessions

    Then build back up. A small planned step back beats grinding the same weight for a month.

This page sets the sets, reps and load to use today. For how those numbers should move over months, read progressive overload.

Sets and reps questions, answered

How many sets and reps should a beginner do?
Two to three sets of 8 to 12 repetitions per exercise is a practical default while you learn the lifts, stopping a few repetitions short of failure. Muscle grows across a wide span of rep ranges, so this is a sensible starting point rather than the only productive one (Schoenfeld et al., 2017) (Currier et al., 2026). Five or six exercises covers the whole body; how long that takes depends on your rest periods, not on a target time.
How much weight should I start with?
Pick a load you could lift about four more times than the target reps (American College of Sports Medicine, 2009). Ramp up in small steps to find it, then take roughly 10 per cent off for your first working set and record the number.
What does reps in reserve mean?
Reps in reserve is how many more repetitions you could have completed with good technique when you stopped the set. Two reps in reserve means you had two left. It is a more reliable way for a beginner to judge effort than trying to reach failure.
When should I increase the weight?
When you complete every set at the top of the prescribed rep range with clean technique and one to two reps still in reserve. Add the smallest increment available and expect your reps to drop back down the range.
How long should I rest between sets?
Two to three minutes on the main squat, hinge, push and pull movements, and a shorter rest of a minute or so on smaller accessory work. In a trial comparing three minutes with one minute between sets, the longer rest produced greater strength and muscle gains, so take the rest you need on the big lifts rather than cutting it to finish sooner (Schoenfeld et al., 2016).
Should beginners train to failure?
No. Training to the point where you cannot complete another repetition is not required: in the current ACSM review of the evidence, training to momentary muscle fatigue did not consistently change results (Currier et al., 2026). Sets still need to be genuinely hard, but stopping a couple of reps short is easier to recover from and easier to keep technique on, which makes it a sensible way for a beginner to train.
Is it better to lift heavy or do more reps?
For a beginner, both build muscle when effort is similar. Moderate weights in the 8 to 12 rep range are easier to learn on and easier to recover from, so start there and add heavier work later.

References

Cited in Cite Them Right Harvard style and listed alphabetically by author. Figures are ranges for healthy adults, not personal prescriptions.

  1. American College of Sports Medicine (2009) 'Progression models in resistance training for healthy adults', Medicine and Science in Sports and Exercise, 41(3), pp. 687-708. doi: 10.1249/MSS.0b013e3181915670. Available at: https://pubmed.ncbi.nlm.nih.gov/19204579/
  2. Currier, B.S., D'Souza, A.C., Fiatarone Singh, M.A., Lowisz, C.V., Rawson, E.S., Schoenfeld, B.J., et al. (2026) 'American College of Sports Medicine position stand. Resistance training prescription for muscle function, hypertrophy, and physical performance in healthy adults: an overview of reviews', Medicine & Science in Sports & Exercise, 58(4), pp. 851-872. doi: 10.1249/MSS.0000000000003897. Available at: https://doi.org/10.1249/MSS.0000000000003897
  3. Schoenfeld, B.J., Pope, Z.K., Benik, F.M., Hester, G.M., Sellers, J., Nooner, J.L., et al. (2016) 'Longer interset rest periods enhance muscle strength and hypertrophy in resistance-trained men', Journal of Strength and Conditioning Research, 30(7), pp. 1805-1812. Available at: https://pubmed.ncbi.nlm.nih.gov/26605807/
  4. Schoenfeld, B.J., Grgic, J., Ogborn, D. and Krieger, J.W. (2017) 'Strength and hypertrophy adaptations between low- vs. high-load resistance training: a systematic review and meta-analysis', Journal of Strength and Conditioning Research, 31(12), pp. 3508-3523. doi: 10.1519/JSC.0000000000002200. Available at: https://pubmed.ncbi.nlm.nih.gov/28834797/
  5. Schoenfeld, B.J., Ogborn, D. and Krieger, J.W. (2017) 'Dose-response relationship between weekly resistance training volume and increases in muscle mass: a systematic review and meta-analysis', Journal of Sports Sciences, 35(11), pp. 1073-1082. doi: 10.1080/02640414.2016.1210197. Available at: https://pubmed.ncbi.nlm.nih.gov/27433992/

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