In this video, Physique Development Coach Alex walks you through how to read and program your workout intensity using RIR and RPE. Managing fatigue is crucial for maximizing muscle growth and strength as well as lowering your risk of injury.

PROXIMITY TO FAILURE (RIR)
This research-based approach to managing fatigue uses a number, often given on a 1–10 scale (see right), to represent “reps in reserve” (RIR): how many reps you have “left in the tank” on a given set. It correlates with your rate of perceived exertion (RPE).

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