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Guide · Intensity

Running by feel: what the talk test is and why it works

By Luis Carvajal · Updated 1 October 2026

In short: running by feel means regulating your effort by what you notice, above all by your ability to talk. If you can say a full sentence comfortably, you're below your first threshold. If talking starts to get hard, you're close to it. It's been validated in the lab and needs no device.

What the talk test is

It's the simplest intensity test there is: while you run, try to say a full sentence out loud. A line from a song, your home address, anything. Then ask yourself one thing: did I say it comfortably?

Why it works: what the studies say

As you raise the intensity, there comes a point where your breathing speeds up more than the effort does. That's the ventilatory threshold. Below it, your body works with room to spare. Above it, breathing takes over and talking gets hard. That's why your voice is a good sensor.

Carl Foster and John Porcari's group at the University of Wisconsin–La Crosse has been measuring this for years. In a treadmill and cycling study, the point where talking started to get hard matched the ventilatory threshold almost exactly, and once talking was no longer comfortable, intensity was always above it (Persinger et al., 2004). They then put it to the test by shifting the threshold on purpose, through training or after donating blood. The talk test moved with it (Foster et al., 2008).

Another study also compared it with the lactate threshold: when participants found it hard to talk, they were very close to that intensity (Quinn and Coons, 2011). A 2014 review sums it up as a valid, reliable and consistent tool for walking, jogging or cycling, in athletes as well as healthy adults and heart patients (Reed and Pipe, 2014). It isn't new, either: the American College of Sports Medicine included it in its guidelines as far back as 1991 (ACE).

It has one limit worth knowing. At efforts above the threshold, your voice takes a while to break: more than two minutes on average (Foster et al., 2008). And the same 2014 review warns that it may not be practical for high-intensity intervals.

The rating of perceived exertion (RPE)

The other tool for running by feel is giving your effort a score. The classic scale is Gunnar Borg's, which runs from 6 (no exertion) to 20 (maximal) (Borg, 1982). There's a simplified 0 to 10 version that many people find more intuitive.

A 2022 review cross-checked the talk test and the Borg scale against the two thresholds measured in the lab. Both tools proved valid for both thresholds, and the equivalences look like this (Bok, Rakovac and Foster, 2022):

Talk testBorg scale (6-20)What it means
You can talk comfortablyBelow 10Below the first threshold. Easy.
Talking takes a bit of effort10-11Around the first (ventilatory) threshold.
You can't talk continuously13-15Around the second threshold. Hard.

The practical approach is to combine them: the talk test during the run, the effort score at the end.

Why choosing your own intensity keeps you coming back

This is what matters most if you want to still be running six months from now. A review of 33 studies found that pleasure drops mainly above the ventilatory or lactate threshold. Below it, most people feel good. Right at the threshold, everyone responds differently. Above it, almost everyone has a worse time. And when people choose the intensity themselves instead of having it imposed, they tolerate higher intensities better (Ekkekakis, Parfitt and Petruzzello, 2011).

That matters because how you feel during exercise predicts whether you come back. In sedentary adults, the emotional response to a moderate session predicted their physical activity six and twelve months later (Williams et al., 2008), and a systematic review of 24 studies reached a similar conclusion (Rhodes and Kates, 2015). That's where the case for self-paced exercise as a way to improve adherence comes from (Williams, 2008).

A recent trial shows it well. Ninety inactive women with obesity did treadmill sessions at an intensity either prescribed by heart rate or chosen by themselves. Heart rate and volume came out similar. Pleasure, enjoyment and wanting to do it again were all higher when they chose (Da Silva et al., 2025).

Feel or heart rate monitor

Training by heart rate zones isn't a bad idea. The problem is where the zones come from. They're almost always calculated from a maximum heart rate estimated from age, such as 208 − 0.7 × age (Tanaka et al., 2001). Those formulas work well for groups, but not for an individual: when nine of them were compared with real exercise tests, all showed poor agreement with the measured maximum (Shookster et al., 2020). If the maximum is wrong, all your zones are wrong.

On top of that, optical wrist sensors get it wrong more often when you move. In a study of several watches and bands, the mean error during activity was 30% higher than at rest (Bent et al., 2020).

Feel doesn't depend on any formula. It adjusts itself to how you are today, to the heat, to a bad night. Heart rate has a different advantage: it's objective and can't be fooled by how keen you are. The sensible approach is to use your voice as your main guide and, if you wear a heart rate monitor, to treat heart rate as supporting data, not something to chase with your eyes.

How to start running by feel

  1. Do the test in the first few minutes. If you can't say the sentence, ease off. It's the most common mistake: starting faster than the day calls for.
  2. Repeat it every so often. On a long run, the effort creeps up even if you don't change speed.
  3. Score it when you finish. From 1 to 10, without overthinking it. After a few weeks you'll see your pattern.
  4. Save the hard stretches for when they're due. If every run ends up as "I can't talk", you won't feel like doing the next one.

If you're starting from scratch or coming back after a break, the talk test is the most useful tool you have: it makes you go easy exactly when it's easiest to overdo it.

Coached Run

Coached Run is built around this idea. A coach with a real voice runs with you over your own music and tells you if you're going too hard for what the session calls for, but never tells you what pace to run. No pace, zones or heart rate on screen. If you wear an Apple Watch or any Bluetooth heart rate monitor, the coach uses it for you. If not, the app works just the same. Three full runs free, then a one-time payment, no subscription.

Download on the App Store

Frequently asked questions

What is running by feel?

Regulating intensity by what you notice rather than by a number on your watch. The most common reference is your breathing: if you can talk comfortably, you're going easy.

Is the talk test reliable?

Yes, for what it's meant for. Several studies have compared it with ventilatory and lactate thresholds measured in the lab, and it matches well. It's less practical for very short intervals.

Is it better to run by heart rate or by feel?

Both are valid. Heart rate zones depend on a maximum that is almost never actually measured, and the wrist is less accurate on the move. Feel adjusts itself to your day. If you have a heart rate monitor, use it as backup.

What effort score should an easy run be?

One where you can talk without breaking up your sentences. On the Borg scale, below 10-11, which is where the first threshold sits according to the 2022 review.

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