The RPE scale explained: rate of perceived exertion for running and lifting

The RPE scale is the cheapest piece of training equipment you'll ever own. No strap, no subscription, no calibration. Just an honest answer to one question: how hard was that?

RPE stands for rate (or rating) of perceived exertion. On the common 1–10 version, 1 is lying on the sofa and 10 is the hardest effort you could possibly produce. It works for a tempo run, a set of squats, a sled push and a hill sprint, which makes it the one intensity language that fits a training week with both running and lifting in it. That's exactly why it's the backbone of one plan for running and lifting. Here's what RPE means, how the perceived exertion scale works for running, what "RPE 8" means in the gym, and how to stop lying to yourself with it.

What is RPE?

RPE is a self-rating of how hard an effort feels, usually on a 1–10 scale. It folds everything into one number: breathing, muscle burn, heart pounding, how much you'd rather be doing something else.

It sounds too soft to be useful. It isn't. A 2022 review of subjective intensity methods concluded that RPE and the talk test are valid markers of both the first and second ventilatory thresholds, the same physiological turning points heart rate zones try to approximate (Bok, Rakovac and Foster, 2022). And the session-RPE method, where you multiply your rating of the whole session by its duration, was shown to track a heart-rate-based training load across steady cycling, intervals and basketball (Foster et al., 2001).

The real advantage is that RPE is universal. Pace means nothing on a hill. Heart rate means nothing on a heavy single. Weight on the bar means nothing on a run. RPE describes all of them, which is what lets a sample hybrid week prescribe intervals on Tuesday and squats on Wednesday in the same language.

The two RPE scales: Borg 6–20 and 1–10

There are two main versions, both from the work of Gunnar Borg.

• ›The Borg 6–20 scale is the original rating of perceived exertion scale, still common in research and clinical settings. It runs from 6 at the bottom to 20 at maximal effort.
• ›The 1–10 scale grew out of Borg's later category-ratio work, which combined a category scale with ratio properties (Borg, 1982). Coaches mostly use a simplified 1–10 version because it's easier to remember mid-workout.

On the 6–20 version, a rating of about 10–11 lines up with the first ventilatory threshold and about 13–15 with the second, according to the review above (Bok, Rakovac and Foster, 2022). The finer points of the Borg 6–20 scale vs the 1–10 RPE scale matter mostly if you read research. For training, use 1–10. That's the RPE scale everyone else on this blog uses, too.

The perceived exertion scale for running

For running, RPE maps neatly onto the five training zones. This is the same mapping used across every exrsz post, so an RPE target and a heart rate target always mean the same thing.

Most of your running should sit at RPE 3–4. Those slow aerobic miles are where the aerobic base gets built, and they're the runs people most often turn into RPE 6 by accident.

RPE in running has some quirks worth knowing:

• ›It responds instantly. Heart rate lags behind effort at the start of a rep. RPE doesn't, which makes it better for short intervals and hills.
• ›It accounts for conditions. RPE 4 on a hot hilly day is slower than RPE 4 on a cool flat one. That's a feature, not a bug.
• ›It drifts with fatigue. Late in a long run, holding the same pace feels harder. Let the rating guide you back down.

Used well, RPE in running means you can pace almost any workout by feel and treat the watch as a receipt.

RPE meaning in the gym: reps in reserve

In the gym, RPE means something more specific. Lifters use a version based on reps in reserve (RIR): how many more reps you could have done with good form before failing.

Zourdos and colleagues (2016) formalized this as a resistance-training-specific scale, where RPE 10 = 0 reps in reserve, RPE 9 = 1 rep in reserve, and so on. They concluded it's a practical method to regulate daily training load.

So "3 sets of 5 at RPE 8" means: pick a weight where, after five reps, you could have done two more. If the bar is moving like it's welded to the floor, it's not RPE 8, whatever the plan says.

Two things from that study are worth knowing. First, how fast the bar moved was strongly linked to the rating: slower reps meant higher RPE. Second, experienced lifters rated their one-rep max as harder than novices did, which suggests beginners aren't great at judging how close they are to failure. That's normal. It gets better with practice.

In most programs, the bulk of strength work sits at RPE 7–9: hard enough to drive progress, far enough from failure to recover. Learning what 7, 8 and 9 feel like under the bar is most of RPE for lifting. How close to failure you should go depends on the lift and the goal, and reps in reserve is the cleanest way to describe it.

Why RPE beats fixed percentages on some days

A program that says "5 × 5 at 80%" assumes you're the same person every day. You're not. Sleep, stress, a hard run yesterday: they all change what 80% feels like. RPE lets the load move with you. On a great day, RPE 8 is heavier than planned. On a bad day, it's lighter, and you still get a productive session instead of a grind.

That doesn't replace planned progression. It steers it. You still need adding load the right way over weeks; RPE just stops you from forcing it on the wrong day. If you're new to lifting, rate the big lifts first, the five movements that matter, and keep most sets at RPE 6–8 while technique settles.

Using RPE across a hybrid week

This is where RPE earns its place. In a week with both running and lifting, it lets you see the total load in one language, which is the whole point of having how to split a week between running and lifting figured out.

A simple rule: no more than two or three sessions a week at RPE 8 or above, across running and lifting combined. A heavy squat day at RPE 8–9 and an interval session at RPE 9 are both hard days, and they need space between them.

Sample hybrid week by RPE:

For runners, the lifting doesn't need to be maximal to be useful; how much strength work runners need is mostly about consistency at RPE 7–8, not grinding to failure.

Session RPE for tracking load

After each session, rate the whole thing from 1 to 10 and multiply by the minutes. A 60-minute easy run at RPE 3 is 180 units. A 40-minute lift at RPE 7 is 280. This is the session-RPE method from Foster et al. (2001), and it's a simple way to compare running and lifting load on the same scale.

If your weekly total keeps climbing and your sessions keep feeling harder at the same work, you're accumulating fatigue. That's when a lighter week helps; how often to deload is usually every three to five weeks in most plans.

Common RPE mistakes

• ›Rating easy runs honestly but hard sets generously. If the bar slowed to a crawl, that wasn't RPE 7.
• ›Making everything RPE 6. Medium everything again. Easy days should be 3–4; hard days 8–9. RPE makes the gap visible, so use it. It's the clearest way to see training quality over quantity in practice.
• ›Rating the warm-up feeling, not the effort. Rate the hard part of the set or rep, not how you felt walking in.
• ›Ignoring it when it disagrees with the plan. If a planned RPE 7 feels like 9, that's data. Adjust the load or pace.
• ›Going to RPE 10 often. Occasional max efforts have their place. Living there is how people stall and get hurt.

How exrsz uses RPE

exrsz builds a periodized plan from your goal, schedule, level and equipment, and gives every run and lift an intensity target in the same 1–10 language. It balances hard and easy sessions across running and lifting in one plan, adapts each week to how you actually trained, and reshuffles missed sessions so you don't end up with three RPE 9 days in a row.

FAQ

What is RPE?

RPE stands for rate of perceived exertion: a self-rating of how hard an effort feels, usually from 1 (very easy) to 10 (maximal). It works for running, lifting and anything else.

What does RPE mean in the gym?

In lifting, RPE is usually based on reps in reserve. RPE 8 means you could have done about two more reps; RPE 10 means you couldn't have done another.

What RPE should easy runs be?

Easy runs should be about RPE 3–4: you can talk in full sentences. That's roughly zone 2 heart rate.

What's the difference between the Borg scale and the 1–10 RPE scale?

The Borg scale runs from 6 to 20 and is common in research; the 1–10 scale is simpler and is what most coaches use. Both measure perceived effort.

Is RPE accurate?

Research shows RPE tracks key physiological thresholds and training load reasonably well (Bok, Rakovac and Foster, 2022), but beginners tend to misjudge how close they are to failure when lifting (Zourdos et al., 2016). Accuracy improves with practice.