The RPE Scale for Lifting and Reps in Reserve

**0 to Elite course · Lesson 25 of 100 · Level 1: Movement Foundations** The RPE scale in lifting is a simple way to measure how hard a set was. Paired with reps in reserve, it tells you whether a weight is too light, too heavy or just right. This lesson finishes Level 1 by teaching you to judge effort. ## What RPE and reps in reserve mean **RPE** stands for "rating of perceived exertion". In lifting it's scored from 1 to 10, where 10 is a maximal effort: you could not have done one more rep. **Reps in reserve (RIR)** is the same idea from the other side: how many more reps could you have done with good form before stopping? The two link up neatly: * **RPE 10** = 0 reps in reserve. Nothing left. * **RPE 9** = 1 rep left. * **RPE 8** = 2 reps left. * **RPE 7** = 3 reps left. * **RPE 6 and below** = 4 or more left. Warm-up territory. Most lifters find reps in reserve easier to judge, so that's what we'll use most. Don't worry about being exact to the half point; being within a rep or so is plenty accurate for a beginner. "Leave two in the tank" is the same as RPE 8. ## Why effort matters In [lesson 24](https://syp-fitness.co.uk/post/sets-reps-and-rest-explained) you learned that muscle grows across many rep ranges as long as sets are hard enough. RPE is how you check "hard enough". A set of 10 with a weight you could have lifted 20 times does very little. A set of 10 that leaves 1-3 reps in reserve is a strong signal to build muscle and strength. Fixed weights can't account for a bad night's sleep or a great day. RPE adjusts to how you are on the day. ## Training to failure: when and when not **Failure** means reaching the point where you can't complete another rep with good form. Going there occasionally is fine, but beginners rarely need to: * Technique tends to break down on the last grinding rep, especially on squats and deadlifts. * It adds lots of fatigue for little extra benefit. * It's riskier on free-weight lifts without a spotter. If you want to push hard, use a machine, as covered in [lesson 23](https://syp-fitness.co.uk/post/free-weights-vs-machines). A good beginner rule: **compound lifts at 2-3 reps in reserve (RPE 7-8), smaller exercises at 1-2 reps in reserve (RPE 8-9)**. ## How to rate a set honestly 1. **Finish the set, then ask:** "If someone offered me money for more clean reps, how many could I have done?" That number is your reps in reserve. 2. **Watch your bar speed.** When reps start slowing down noticeably, you're usually 2-3 reps from failure. 3. **Watch your form.** If technique slips, the set is effectively over, even if you could grind out more. 4. **Write it down.** Note the RPE next to every working set. Lesson 28 on keeping a [training log](https://syp-fitness.co.uk/post/how-to-keep-a-training-log) shows you how. Beginners nearly always underestimate how many reps they have left. A useful test: once in a while, on a safe exercise like a machine row, keep going after your planned reps until you truly can't do another. Compare the result with your guess. Most people are surprised. ## Using RPE to choose your weights Say your plan reads "3 x 8, RPE 8". Pick a weight you think you can lift about 10 times and do 8. Then adjust: * Felt like RPE 6 (4+ left)? Add weight next set. * Felt like RPE 8? Spot on, keep it. * Felt like RPE 10, or form broke? Drop the weight. This is the bridge to [progressive overload in lesson 27](https://syp-fitness.co.uk/post/progressive-overload-explained): as you get stronger, the same weight drops in RPE, which tells you it's time to add load. > **Safety:** RPE is about muscular effort, not pushing through pain. Stop and see your GP if you feel chest pain, dizziness, unusual breathlessness or palpitations while training, and see a physio for joint pain that doesn't settle. ## Your action steps 1. Write an RPE or reps-in-reserve number next to every working set this week. 2. Aim your compound lifts at 2-3 reps in reserve and adjust weights between sets. 3. Do one "calibration set" on a machine: guess your reps in reserve, then test it. 4. Review Level 1: re-read any technique lesson from 11-24 where your form still feels shaky. ## Frequently asked questions ### What does RPE 8 mean in lifting? RPE 8 means the set felt hard and you could have done about two more reps with good form. It's a common target for building strength and muscle. ### Should beginners train to failure? Rarely. Most beginners make great progress leaving 1-3 reps in reserve, which keeps technique clean and fatigue manageable. Save true failure for safe machine exercises. ### What is the difference between RPE and RIR? RPE rates effort on a 1-10 scale, while RIR counts how many reps you had left. They match up: RPE 8 equals two reps in reserve, RPE 9 equals one. ## Keep going Previous: [Lesson 24: Sets and Reps Explained, Plus How Long to Rest](https://syp-fitness.co.uk/post/sets-reps-and-rest-explained) Next: [Lesson 26: Your First Programme: A Full Body Workout 3 Days a Week](https://syp-fitness.co.uk/post/full-body-workout-3-days-a-week) Lost your place? [See the full course map](https://syp-fitness.co.uk/post/how-to-get-fit-from-scratch). > **Want Artem to coach you through it?** SYP Fitness is a private 1-to-1 personal training studio at 2-4 Navigator Square, Archway, London N19 3UB. Rated 5.0 from [106 Google reviews](https://share.google/yAAPDk0VhwxmSzymT). [Book a free consultation](https://syp-fitness.co.uk/#apply) or [WhatsApp Artem](https://wa.me/447301512215) on 07301 512215.