Rated Perceived Exertion (RPE) Scale. The RPE scale is used to measure the intensity of your exercise. The RPE scale runs from 0 – 10. The numbers below relate to phrases used to rate how easy or difficult you find an activity.
0 – Nothing at all
0.5 – Just noticeable
1 – Very light
2 – Light
3 – Moderate
4 – Somewhat heavy
5 – Heavy
6
7 – Very heavy
8
9
10 – Very, very heavy