What rate of perceived exertion (RPE) means.

The rate of perceived exertion is used to gauge your intensity in cardio workouts. Here are some distinct levels. Typically after RPE 6-7 you cross your anaerobic threshold and this is when your body stops using your body fat as it’s primary source of energy.

RPE 1-2: very easy; you can converse with no effort.

RPE 3: Easy; you can converse with almost no effort.

RPE 4: Moderatly easy; you can converse comfortably with little effort.

RPE 5: Moderate; conversation requires some effort.

RPE 6: Moderatly hard; conversation requires quit a bit of effort.

RPE 7: Difficult; conversation requires a lot of effort.

RPE 8: Very difficult; conversation requires maximum effort.

RPE 9-10: Peak effort; no-talking zone.

For your reference when reading www.shape.com or Shape Magazine.