How should an individual use the Rate of Perceived Exertion (RPE) scale to adjust their workout intensity during exercise?

RPE reflects how hard exercise feels, so it can guide adjustments to keep effort in the intended range. For moderate endurance activity, an RPE of 4–5 is a reasonable target: increase effort if it feels easier than that and ease off if it feels harder. Keeping RPE below 3 or at 9–10 throughout would not suit moderate exercise.

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