Heart Rate Training for Runners

Heart rate training means using a monitor to see how hard your body is working so you can match effort to the session: easy running sits at roughly 60-75% of your maximum heart rate, tightening to 80-90% or more for tempo (comfortably hard, sustained) and threshold work. Below: why a monitor helps, how beginners and experienced runners use it differently, when it helps and when it doesn't, how to set your zones, what throws your readings off, its pitfalls, how to get started, and answers to frequently asked questions.

Most runners I coach have the opposite problem to the one they expect: not too little effort, but easy days run so fast they never properly recover. A number on your wrist can fix that within a week, or quietly mislead you for months, and the difference comes down to how you use it.

Why Use a Heart Rate Monitor in Your Training?

Your heart rate monitor does one simple job well: it keeps your effort honest. Most new athletes I coach are running their easy days 30-60 seconds per kilometre faster than they should — until a zone alert makes that visible.

Any global positioning system (GPS) running watch or chest-strap monitor does this today — Garmin, Coros, Polar, Apple Watch, Whoop and similar all track heart rate in real time, so the specific device matters less than actually wearing one.

Set your zones (more on that below), and if you go over or under the limit, an alert tells you to ease off or pick it up.

Pace discipline is a skill. You can build it without a monitor — plenty of experienced runners do. But from years of working with beginners, I've seen how much faster a zone alert builds that skill compared with guesswork alone. Suddenly, runners slow down. And accept that easy pace really is that easy.

Heart Rate Training: Beginners vs. Experienced Runners

For beginners, a monitor is invaluable. Most beginner runners train too fast, and a zone alert is the quickest way to fix that. I recommend every beginner runner picks one up.

Experienced runners get something different from it: a way to gauge intensity across a varied week. Easy runs, tempo runs or cruise intervals, steady-state runs, repeats, and long slow runs each ask for a different effort — and a monitor helps you tell them apart.

It's also useful for keeping your ego in check. On a hot or tired day, when your heart rate is climbing fast for what should be an easy effort, that's your cue: take it down a notch or two. Recovery runs matter more the harder you're training, and heart rate is a useful pointer to whether you're actually recovering.

When Heart Rate Training Helps, and When It Doesn't

Here's my honest, coach's verdict on where a heart rate monitor earns its place — and where it doesn't:


That lag is physiological, not a fault with your monitor — heart rate takes a few minutes to climb into a new zone, which makes it poor real-time feedback for anything short and fast. And on race day, adrenaline shifts the numbers by enough that I don't fully trust mine. I use the pace function on my watch during races, not heart rate.

Before race day, I lean on the Race Conversion Calculator and the Running Pace Calculator to work out exactly what pace I should be racing at — see using a heart rate monitor on race day for the full racing breakdown.

Establishing Your Heart Rate Zones

A heart rate zone is a range, not a single number. Don't focus on hitting exactly 155 beats per minute — focus on staying somewhere between 150 and 160.

To set your own zones, start here: find your max heart rate. From there, you've got two ways to calculate zones: the Zoladz Method calculator, which is simpler and works by subtracting set numbers of beats from your max heart rate, and the Karvonen Method calculator, which factors in your rest heart rate too, for a slightly more precise result.

In practice, the two land close together for most runners — use whichever one you've got the numbers for.

What Throws Your Heart Rate Off (External and Internal Factors)

Your heart rate isn't only a function of pace. External conditions — temperature, humidity, and wind — all play a part. On a warm day, your heart rate runs higher, and it climbs faster than it would in cooler conditions. The same goes for heart rate at altitude — thinner air pushes your numbers up too.

Internal factors matter just as much. Poor sleep, stress, and an oncoming illness can all show up as an unusually high heart rate on what should be an easy run. If you've had a bad night, or you're feeling off, expect your numbers to run high — that's not a fitness problem.

So listen to your body as well as your monitor. The two together give you a far more honest read than either one alone.

Heart Rate Monitor Pitfalls: What It Can't Tell You

Two things worth knowing before you lean on your monitor too heavily.

First, the number is an indicator, not a target. Train to a zone, not a single figure — 150-160bpm, not 155bpm exactly.

Second, your heart rate takes a few minutes to settle after a pace change. Start an interval session or a tempo run and don't obsess over the number in the first minute or two — it's all over the place, and checking it every ten seconds won't tell you anything useful. Give it a couple of minutes, then check. If it's too high or too low for your zone, adjust the pace then — not before.

Getting Started: What to Do With This

If you're new to this, start with establishing your zones — that's the section above, and it's the foundation everything else builds on. If you've been running with heart rate for a while and want the racing take, revisit the reliability table above; it's the short version of my honest verdict.

If something about your numbers looks off — reading high on an easy run, refusing to settle into a low zone outdoors, or seemingly stuck too low — I've written dedicated pages for exactly that: struggling to stay in your zone?, heart rate too high on an easy run?, heart rate seems too low?, and why your easy-run heart rate won't cooperate

And if you're wondering how any of this changes on race day, I've covered that in full over on using a heart rate monitor on race day.

Your heart rate monitor is a genuinely useful tool — but it's an indicator, not gospel. Use it where it's reliable, trust pace and effort where it isn't, and you'll get the best of both.

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