RPE vs RIR
RPE (Rate of Perceived Exertion) and RIR (Reps in Reserve) describe how hard a set was relative to failure. Same idea, two scales — coaches should speak both fluently.
What is RPE?
RPE is a 1–10 effort scale. RPE 10 = no reps left; RPE 8 ≈ two clean reps left. Modern strength RPE is tied to reps in reserve (Tuchscherer-style), not the old Borg cardio-only chart.
What is RIR?
RIR counts how many clean reps you could still do. RIR 0 = failure; RIR 3 = three reps left. Many athletes find “reps left” more intuitive than a 1–10 scale.
Which should coaches use?
Either works if the client is calibrated. RIR is often easier to teach; RPE is common in powerlifting templates. Pick one primary scale per program and convert when needed.
RPE vs RIR
| RPE | RIR | |
|---|---|---|
| Scale | 1–10 effort | Reps left before failure |
| Failure | RPE 10 | RIR 0 |
| Hard working set | RPE 8–9 | RIR 1–2 |
| Teaching ease | Needs calibration | Often more intuitive |
| Common use | Powerlifting / strength apps | Hypertrophy coaching cues |
Preguntas frecuentes
Is RPE 8 the same as RIR 2?
Yes in modern strength practice: RPE ≈ 10 − RIR. RPE 8 means about two clean reps left (RIR 2).
Can clients use both?
Yes, but programs should prescribe one primary scale to avoid confusion. Convert in the coach notes if needed.
Takeaway
RPE 8 ≈ RIR 2. Teach one scale well, keep a conversion chart, and never confuse “hard breathing” with true proximity to failure on a lift.
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