What is RPE?

This is the scale we will us to show the intensity of your workouts without a power meter.

The Rating of Perceived Exertion (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. For example, 0 (nothing at all) would be how you feel when sitting in a chair; 10 (very, very heavy) is how you feel at the end of an exercise stress test or after a very difficult activity.

Active Recovery
0 – Nothing at all
0.5 – Just noticeable
1 – Very light
2 – Light
3 – Moderate

Endurance
4 – Somewhat Heavy (Lower Endurance)
5 – Heavy (Upper Endurance)

Tempo
6 – Challenging Aerobic

Threshold
7 – Very heavy – Lactate Threshold
8 – Climbing – solid 8

VO2 Max
9 – VO2 Max
10 – Very, very heavy – Sprint

Additional reading
http://home.trainingpeaks.com/articles/cycling/estimating-training-stress-score-(tss)-by-joe-friel.aspx
http://www.trainingbible.com/joesblog/labels/RPE.html