RPE is Rate of Perceived Exertion.

RPE goes from 1 to 10, with 1 being the slowest/lowest effort possible, and 10 being all-out/as fast as you can go.

Be sure to check your Zones tab in the app, to see your RPE chart to get a sense of where your rates of perceived exertion fall.

So, for example, if you're being told in a workout to start slow and work up to 7-8 RPE, that means you'll start slowly and get yourself running very fast. Not AS fast as you can go, but almost.

(And remember, all of the numbers on this chart shown here will not be the same as your numbers -- because YOUR chart will reflect your own specific numbers, based on the Max HR, Resting HR, FTP, and Race Pace numbers you enter on that page.)