RPE and RIR: read strength-training effort labels

RPE means rating of perceived exertion: how hard an effort feels. RIR means repetitions in reserve: how many more repetitions you estimate you could have completed. In strength training, the meaning of an RPE number depends on the scale and whether it describes one set or the whole session.

Record the label with the number. “Last set, RIR 2” carries useful context. An unlabelled “2” could refer to several different parts of a training entry.

Read RIR as an estimate of repetitions left

If you record three RIR after a set, you estimate that you could have performed three more repetitions under the intended exercise conditions. NASM's guide to repetitions in reserve explains this remaining-repetitions approach.

The remaining repetitions are estimated. They are not extra repetitions you have already performed or an instruction to add them. The exercise variation, range of movement, and intended technique belong in the meaning of the estimate.

For example, after a hypothetical set of eight repetitions, a lifter records “RIR 3.” The completed work is eight repetitions. The effort note is an estimate of three remaining. Keep both fields; combining them into “11 reps” would change the record.

Use the right RPE-to-RIR mapping

One resistance-training RPE scale anchors ratings to estimated repetitions remaining. The 2020 review Methods for Regulating and Monitoring Resistance Training discusses this scale alongside other monitoring methods. Its full text gives these relationships:

This table decodes that named scale. It supplies no target effort for a workout. Other RPE scales and uses exist, so keep your program's key beside the log.

A session rating describes the perceived difficulty of the whole session. A set rating describes the stated set. The review treats these as separate applications. A hard final set and a hard overall session should therefore have separate labels if your coach collects both.

Separate target effort from reported RPE or RIR

A program's RPE or RIR target tells you the effort that was intended. Your completed entry tells the coach what you perceived. Copying the target into the result field hides any difference.

This hypothetical log shows the distinction:

The note gives the coach something specific to clarify. It does not establish whether the load or next session should change.

Record uncertainty in an RIR estimate

An RIR estimate can be useful even when you are learning how to make it. Attach a short explanation such as “Unsure between two and three remaining” to the actual set. Ask the coach what cues and exercise conditions their scale expects you to consider.

Keep the reporting method consistent from one review to the next. If the program changes scale, write the new scale name and effective date. Comparing unlabelled numbers from different scales creates an avoidable problem.

Use the training-log guide to keep work and effort in separate fields.

Get the effort label explained in context

Bring one complete exercise entry and the program key when seeking help. A Nightmare Muscle personal-training inquiry can state which RPE or RIR label you want explained. The aim is a definition you can apply and record consistently.