RPERate of Perceived Exertion
A 1–10 scale for how hard a set felt, used to regulate training intensity.
RPE (Rate of Perceived Exertion) rates how hard an effort felt on a scale, most commonly 1–10 in lifting. An RPE of 10 means maximal — no more reps possible; an RPE of 8 means roughly two reps were left in reserve.
It matters because it lets you regulate intensity by feel on the day, accounting for fatigue, sleep and stress, rather than rigidly chasing a fixed number when your body isn't up to it.
In lifting, RPE is closely related to reps in reserve (RIR): RPE 10 ≈ 0 RIR, RPE 9 ≈ 1 RIR, and so on.
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Written and reviewed by Mathew Beale — MSc Biotechnology, University of Reading.
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