How often have you read fitness articles or are told in your fitness class to work at an RPE of 7, for example, or to work at a moderate pace and never really understood how hard that is meant to be? Here is a practical measure of what those levels actually mean...
RPE 1-2: Very easy - you can converse with no effort.
RPE 3: Easy - you can converse with almost no effort.
RPE 4: Moderately Easy - you can converse comfortably with little effort.
RPE 5: Moderate - conversation requires some effort.
RPE 6: Moderately hard - conversation requires quite a bit of effort.
RPE 7: Difficult - conversation requies a lot of effort.
RPE 8: Very Difficult - conversation requires maximum effort.
RPE 9-10: Peak Effort - no talking zone!