The RPE scale may be used along side monitoring your heart rate to help you determine how you might feeling while you are exercising which will help you to get optimal exercise benefits. This chart is easy to remember while you are participating in an activity. Rate of Perceived Exertion (RPE) 0 Nothing at all .5 Very very weak 1 2 Weak 3 Moderate 4 Somewhat Strong 5 Strong 6 7 Very strong 8 9 10 Maximal Try to stay between 3 and 6 during the entire session. (Including during your warm-up and cool-down.)