Perceived effort (RPE)

RPE is a score from 1 to 10 you give to a session’s effort: 1 is very easy, 10 is your maximum. It is simple but reliable, because it accounts for fatigue, heat or sleep that the numbers can’t see.

• An easy run is about 3 or 4, a tempo run 6 or 7, intervals 8 or 9.

After a session, Kadence asks how it felt; a high score makes the next session more cautious.