What is Autoregulation?
In practice, autoregulation replaces rigid prescriptions with target effort. Instead of "lift 100 kg for 5 reps," you might aim for "5 reps at RPE 8" and let the load adjust to the day.
The Problem with Fixed Percentages
Traditional programming prescribes weights as percentages of your 1RM. While simple, this approach has limitations.
Daily Fluctuations
Your true strength varies day-to-day based on sleep, stress, nutrition, and fatigue. 80% of your 1RM might feel like 75% on a good day or 85% on a bad day.
Outdated Maxes
Your 1RM changes over time. If you tested it months ago, percentages are based on old data that may not reflect current strength.
Exercise Variation
Different exercises have different percentage relationships. Your squat RPE curve isn't the same as your bench press curve.
Autoregulation addresses these limitations by measuring the actual difficulty of a set rather than relying only on theoretical percentages. You adjust load to achieve the intended training effect and support progressive overload.
Understanding the RPE Scale
RPE (Rate of Perceived Exertion) measures how hard a set felt on a scale of 1–10. In strength training, we primarily use RPE 6–10.
| RPE | Description | Reps Left |
|---|---|---|
| RPE 10 | Maximum effort, couldn't do another rep | 0 (failure) |
| RPE 9.5 | Maybe could have done 1 more, uncertain | 0–1 |
| RPE 9 | Definitely had 1 more rep | 1 |
| RPE 8.5 | Definitely 1, maybe 2 more reps | 1–2 |
| RPE 8 | Could have done 2 more reps | 2 |
| RPE 7 | Could have done 3 more reps | 3 |
| RPE 6 | Could have done 4+ more reps | 4+ |
RPE scale for strength training with corresponding reps in reserve
After each set, ask yourself: "How many more quality reps could I realistically have done?" Be honest. Most lifters initially overestimate their RPE (thinking sets were harder than they were).
Understanding RIR (Reps In Reserve)
RIR is a more direct measurement - simply count how many reps you had "in the tank" when you stopped.
| RIR | Meaning | Equivalent RPE |
|---|---|---|
| RIR 0 | Hit failure, no reps left | RPE 10 |
| RIR 1 | Could do 1 more rep | RPE 9 |
| RIR 2 | Could do 2 more reps | RPE 8 |
| RIR 3 | Could do 3 more reps | RPE 7 |
| RIR 4 | Could do 4 more reps | RPE 6 |
RIR and RPE conversion chart
They're interchangeable. Some prefer RPE because it's a positive scale (higher = harder). Others prefer RIR because it's more concrete. Many lifters and programs use RPE more often for compound lifts and RIR for accessories, but either system can work for both. Use whichever feels more intuitive.
How to Use Autoregulation in Practice
Here's how to implement RPE-based training in your workouts.
Warm Up to Your Working Weight
Perform warm-up sets with increasing weight. Pay attention to bar speed and how each set feels. This calibrates your RPE sense for the day.
Hit Your Target RPE
If the program says "5 reps @ RPE 8," work up until 5 reps feels like you could do 2 more. The exact weight can change day to day - the target effort matters most.
Adjust Mid-Workout
If set 1 was RPE 8 and set 2 feels harder, you can keep the weight or reduce slightly. The goal is consistent RPE across sets, not necessarily consistent weight.
Log Everything
Record weight, reps, AND RPE for each set. Over time, this data reveals your true progress and daily readiness patterns.
What RPE Should You Train At?
Different RPE ranges serve different purposes in your training.
| RPE Range | Best For | Notes |
|---|---|---|
| RPE 6–7 | Warm-ups, technique work, deloads | Minimal fatigue, high quality reps |
| RPE 7–8 | Volume work, accessories, most training | Common working range for hypertrophy training |
| RPE 8–9 | Main lifts, strength focus | Standard working set intensity |
| RPE 9–10 | Testing, peaking, occasional top sets | Use sparingly, high fatigue |
Recommended RPE ranges for different training purposes
Training to true failure every set leads to excessive fatigue, poor recovery, and eventual burnout. Most hard working sets are usually kept below all-out failure, often around RPE 7–9 depending on the exercise and goal. Save RPE 10 for occasional testing or competition. Higher RPE sets are more fatiguing, which affects how much total weekly volume you can recover from.
Improving Your RPE Accuracy
Learning to gauge RPE accurately takes practice. Here are strategies to improve.
Test Occasionally
Occasionally compare your estimated RPE with an AMRAP set or video review. If you regularly have more reps left than expected, your estimates may be too conservative.
Track Patterns
Log RPE after every set. Over weeks, you'll see patterns - maybe you always underestimate squats but overestimate bench.
Give It Time
RPE accuracy takes time to develop. Do not expect perfection immediately. The skill improves with experience.
Other Autoregulation Methods
RPE/RIR isn't the only way to autoregulate. Here are other approaches.
Use a device to measure bar speed. When velocity drops below a threshold (e.g., 0.5m/s for strength), you've reached target intensity or should end the set.
Stop the set when rep quality noticeably deteriorates - technique breaks down, bar speed drops significantly, or you need to grind. Simple and effective.
HRV can be one additional recovery marker, but it is noisy and individual - it should not be used in isolation to make training decisions.
Who Benefits Most from Autoregulation?
Great For
- Intermediate/advanced lifters
- Those with variable schedules
- Athletes managing high stress
- Powerlifters and strength athletes
Less Ideal For
- Complete beginners (need to learn the skill)
- Those who need strict structure
- Lifters who struggle to judge effort honestly
- Those who lack body awareness
Sources & References
- Helms ER, Cronin J, Storey A, Zourdos MC. (2016). "Application of the Repetitions in Reserve-Based Rating of Perceived Exertion Scale for Resistance Training." Strength Cond J, 38(4): 42-49. PubMed
- González-Badillo JJ, Sánchez-Medina L. (2010). "Movement Velocity as a Measure of Loading Intensity in Resistance Training." Int J Sports Med, 31(5): 347-352. PubMed