What is RPE?
RPE (Rate of Perceived Exertion) is a self-assessment tool used to measure how challenging a set feels. By assigning a number on a scale to each set, you can track the intensity of your effort and better manage your training. This approach helps reduce the risk of injury and overtraining while allowing you to adjust intensity levels according to your specific goals.
What is RIR?
RIR (Reps in Reserve) is another way to measure how challenging a set is. Rather than using a numerical scale like RPE, RIR estimates how many repetitions you could still perform after finishing a set. It shows how many reps are left “in the tank,” which will give you a clear indication of how close you are to failure.
RPE VS. RIR
| Method | What it Measures | How it Works | Focus |
| RPE (Rate of Perceived Exertion) | How hard the set feels | Uses a numerical scale (usually 1–10) to rate effort | Subjective perception of intensity |
| RIR (Reps in Reserve) | How close you are to failure | Estimates how many reps you could still complete after finishing the set | Performance capacity left “in the tank” |
How does the RPE tracking work in Hevy?
The Hevy app includes an RPE tracking feature, which you can enable in the settings. While RIR isn’t available as a separate option, the RPE scale comes with descriptions that explain how many reps you likely had left, making it easy to estimate RIR through RPE.
Instructions on how to use:
1. Ensure the RPE toggle is enabled in the settings (Settings > Workouts > RPE tracking - toggled on)
2. Add an exercise to an active workout or start a routine as a workout.
3. On the far right side of each set will be the column for RPE
4. Tap “RPE” for the set you are completing
5. The “Log Set RPE” screen will appear with a number scale from 6-10
6. Select the number which matches the intensity you feel. Each number will have a brief description indicating the number of reps in reserve you believe you have.
7. Select the number you would like and tap “Done.”
The next time you complete the same exercise in an active workout, the previous column will display your last RPE. (eg. 50lbs x 10 @ 8.5 RPE)
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