The RPE (Rate of Perceived Exertion) scale is a way for lifters/runners to subjectively measure the intensity of a lift/exercise, which they usually then base the rest of their training day around. RPE Scale 10 — At your max, you have no more reps. 9 — There’s another rep in the tank, but it’s a grind. 8 — You’re beginning to hit your 2-4 rep stride. 7 — Often, a weight one can move with power (5-7ish reps). 6 — Weight that one can move quickly for speed work ( /- 8 reps pending on speed/trainin