In this article

The short answer: Start lighter than feels necessary. For the first session, pick a load you could lift for about three or four more reps than the number written on the program (three to four reps in reserve), then add weight within each exercise until the last set sits near your target effort. Your first week is a calibration, not a test. After two or three weeks of logged sets, your own numbers, not a formula, should set the working weights.

  1. 01Why Start Light
  2. 02Working Weight
  3. 03Find the Number
  4. 04Judging Effort
  5. 05Adjusting
  6. 06FAQ
  7. 07Key Takeaways
  8. 08References
Jump to key takeaways

Why should you start lighter than you think?

The first weeks of a program are when you are least accurate at judging load. You are learning the movement, the equipment, and what a hard set actually feels like. Starting too heavy tends to cost you form, soreness, and consistency; starting a little light costs you almost nothing, because you can add weight at the next set or the next session.

Too heavy

Reps slow and ragged, form drifts, and you carry heavy soreness into the next session.

About right

Clean reps, a few left in the tank, and room to add load next time.

Too light

Easy to fix. One or two extra jumps and you are in range.

The cost is asymmetric, which is why a conservative first week is a reasonable heuristic. It is not a research-derived rule. For how loads then move over time, see how to track progressive overload.

What counts as the right starting weight?

The right working weight is the load that lets you finish the prescribed reps with good form while leaving a planned number of reps unused. That unused number is called reps in reserve (RIR), and it is the most practical way to describe how hard a set was. Zourdos and colleagues (2016) built an RPE scale around it, where a rating of 10 means no reps left and 8 means about two left.

RPE 10
No reps left. You could not have done another with good form.
RPE 9
About one rep left (1 RIR).
RPE 8
About two reps left (2 RIR).
RPE 6 to 7
Three to four reps left. A sensible first-week target for most lifts.

Rep range also matters less than people assume. A meta-analysis by Schoenfeld and colleagues (2017) found that heavier loading produced larger strength gains, while muscle growth was similar across a wide range of loads when sets were taken close to failure. So pick the rep range your program prescribes and make the load fit it, rather than hunting for a perfect percentage.

How do you find the number on the first day?

Use a short ramp: add weight across a few warm-up sets until a set at the prescribed reps feels like RPE 6 to 7. Then treat that as your first working weight. You do not need a one-rep max test, which is more demanding and less useful when you are new to a lift.

1
Start with the empty bar or a very light weight and do a few reps to groove the movement.
2
Add weight in modest jumps and do the prescribed reps each time, stopping well before they slow down.
3
Stop when the set feels hard but clean. You could name three or four more reps you could have done.
4
Write it down with the reps and how it felt. That entry is next session's starting point.

Common Misconception

"A real program starts at a heavy weight." Starting loads from a body weight chart or a one-rep max calculator are estimates. Your logged sets beat them within a couple of weeks.

How well can you judge how many reps are left?

Less well than you would like, especially at first. In a study of how well people predicted repetitions to failure, Steele and colleagues (2017) found that lifters tended to be imperfect at it, with accuracy improving as training experience grew. That is why a beginner's "three reps left" can really be one or six.

Makes ratings more reliable

  • • Use the same exercise and rep range for a few weeks
  • • Watch bar speed: a clear slowdown means you are close
  • • Rate the set right after finishing it

Makes ratings drift

  • • Rating a set hours later from memory
  • • Higher rep sets, where the end is harder to see
  • • Changing exercises every week

Helms and colleagues (2016) described how to build RIR-based ratings into a training plan as a way to adjust load set to set. Treat your early ratings as rough, and let the log correct them. More on effort levels in training intensity explained.

How should you adjust over the first few weeks?

Move up when the prescribed reps feel easier than planned, and hold when they match. A commonly used heuristic is the two-for-two idea: if you can complete two or more extra reps than prescribed on the last set in two sessions in a row, raise the load. The ACSM position stand on resistance training progression (Ratamess et al., 2009) describes raising load gradually once the current load is handled with ease, so use modest jumps, smaller for upper body and isolation lifts.

Week 1

Calibrate. About 3 to 4 reps in reserve, clean form, log everything.

Week 2

Add load where last week felt easy. Aim closer to 2 to 3 in reserve.

Week 3 on

Work sets sit near the effort the program calls for, and progression takes over.

Caveat

The week-by-week effort targets here are practical heuristics, not figures from a trial. Joint pain, a sharp pinch, or dizziness is a reason to stop and, if it persists, to talk to a clinician. This article covers load selection, not diagnosis or treatment.

Early gains in the first weeks are partly learning, so strength can rise faster than muscle does. If weekly volume climbs too, see how to use training volume.

Frequently asked questions

Should I test my one-rep max before starting?

Usually not. A max test is demanding and less accurate for a new lifter. A short ramp to a clean set at the prescribed reps gives you a more useful starting number with less risk.

What if I only have dumbbells in fixed jumps?

Pick the closest weight that leaves you in the target reps in reserve and adjust the rep count within the range. Moving up a rep or two before changing dumbbells is a reasonable way to bridge a large jump.

What if the first week feels too easy?

Good. Add weight at the next session, or at the next set if the movement is simple. A light first week costs you nothing, and you recover the difference within a week or two.

Do I use the same method for every exercise?

The method is the same, but the starting load differs by exercise. Compound lifts like squats and presses usually start heavier than isolation moves, so ramp each lift separately.

When do I stop using the conservative rule?

When your logs show stable, repeatable ratings for a couple of sessions on an exercise. At that point, progress by the program's own rule instead of by a first-week heuristic.

What to remember

The short version.

  1. 1Start lighter than feels necessary: about 3 to 4 reps in reserve for the first session is a practical heuristic.
  2. 2Use a short ramp to a clean set at the prescribed reps, not a one-rep max test.
  3. 3Reps in reserve and RPE describe effort; early ratings are imperfect and improve with experience.
  4. 4Pick the program's rep range and let load follow, since muscle growth is similar across many loads taken close to failure.
  5. 5Add weight when the prescribed reps feel easier than planned, using modest jumps.
  6. 6Log every set so your own numbers replace estimates within two or three weeks.

Keep reading

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ReferencesSources

Key Studies

  • Zourdos et al. (2016) Journal of Strength and Conditioning Research. Novel resistance training-specific RPE scale measuring repetitions in reserve.
  • Steele et al. (2017) PeerJ. Ability to predict repetitions to momentary failure is not perfectly accurate, though it improves with resistance training experience.
  • Schoenfeld et al. (2017) Journal of Strength and Conditioning Research. Meta-analysis of low- versus high-load resistance training for strength and hypertrophy.

Guidelines and Reviews

  • Ratamess et al. (2009) Medicine and Science in Sports and Exercise. ACSM position stand on progression models in resistance training for healthy adults (since updated by ACSM).
  • Helms et al. (2016) Strength and Conditioning Journal. Application of the repetitions in reserve-based rating of perceived exertion scale for resistance training.