RPE stands for Rate of Perceived Exertion. It’s a scientifically proven method to measure how hard you feel you are working during exercise. The RPE scale typically runs from 1 to 10.
1–3 → Very light effort, warm-up level.
4–6 → Moderate effort, sustainable for longer training.
7–8 → Hard effort, challenging but still under control.
9 → Very hard effort, close to your maximum.
10 → Maximum effort, no more reps possible.