01 · Why heart rate zones matterWhy heart rate zones are so valuable
Training by heart rate gives you much more control over your effort than pace or feel alone. Pace is affected by wind, hills, and fatigue; your heart rate shows how your body is actually responding. That lets you dose your training more precisely, strengthen your aerobic base, and avoid overload.
Especially during easy runs, tempo runs, and harder blocks, a running watch shows right away which zone you are in, and whether that is where you should be today. That keeps your plan realistic and tuned to how much your body can handle on a given day.
In this article you will learn what the five zones are, how to set your own training zones, what zone 2 running really is, and how to spread your week across the zones.
Want to combine heart rate with better breathing? Check out Breathing techniques while running.
Want to understand your data even better? Read Using wearables to track your progress for the best ways to interpret this information.
02 · The five heart rate zonesThe five heart rate zones at a glance
Zone 1
Zone 2
Zone 3
Zone 4
Zone 5
Heart rate zones help you give every workout exactly the right effect. Each zone asks for a different level of effort and trains something different. Once you understand what happens in your body at different heart rates, you can build your week smartly: easy enough to strengthen your base, but hard enough to get faster and more efficient. This model works for beginners and experienced runners alike and is the basis of almost every modern training plan.
The table below shows two ways to express the zone limits. The first is a percentage of your maximum heart rate (max HR). The second is a percentage of your heart rate reserve: the difference between your maximum heart rate and your resting heart rate. You will also see how each zone feels and what it trains.
| Zone | % max HR | % reserve | How it feels | What it trains |
|---|---|---|---|---|
| Zone 1 – Recovery | 60–70% | 45–60% | Very comfortable; you can talk with ease | Recovery and blood flow: recovery runs, warm-up, cool-down |
| Zone 2 – Aerobic base | 70–80% | 60–70% | Easy and relaxed; full sentences are no problem | Endurance: easy runs, long run, base building |
| Zone 3 – Tempo zone | 80–87% | 70–80% | Firm; audible breathing, short sentences | Rhythm and aerobic power: tempo runs of 20–40 min |
| Zone 4 – Threshold zone | 87–93% | 80–90% | Hard; you can only say a few words | Your threshold: intervals of 4–8 min, threshold runs |
| Zone 5 – Anaerobic system | 93–100% | 90–100% | Very hard; only sustainable briefly | Maximum oxygen uptake: intervals of 2–5 min, hill repeats |
The heart rate reserve percentages are rounded and assume a resting heart rate of about 50 to 60 beats per minute. If yours is higher, the lower limits of zones 1 and 2 shift down a little. During very short sprints your heart rate cannot catch up; run those by feel or pace.
Zone limits are conventions, not hard switches in your body: you move gradually from one zone to the next, and where your thresholds sit varies from runner to runner. An exercise test with lactate or gas analysis gives the most precise answer. For most recreational runners, the percentages above are a good starting point.
Want to use these zones to improve your speed? Also check out Improve running speed: 6 proven methods.
03 · Set your training zonesHow to set your training zones
Your heart rate zones are only useful if the numbers behind them are right. That is why everything starts with a realistic estimate of your maximum heart rate (max HR) and, for the Karvonen method, your resting heart rate. You do not need a complicated lab test: a few practical steps give you zones that are accurate enough for effective training.
Step 1: find your maximum heart rate
Your maximum heart rate is personal and says little about how fit you are. It can differ a lot from what a formula predicts: coach Jack Daniels describes a 30-year-old runner with a max HR of 148, more than 40 beats below what 220 − age suggests.
Field test (recommended). After a good warm-up, run hard uphill for 2 minutes a few times and check your heart rate at the top. Jog easily back down. If your heart rate is higher than after the previous rep, do another one. Once it stops rising, you are close to your maximum. No hill nearby? A few solid 800-meter repeats on a flat stretch work too. The highest number of BPM you see is a good estimate of your max HR. Formula. 220 − age is easy, but often inaccurate for an individual. The formula 208 − 0.7 × age fits better on average, especially for older runners, but it can still be off by more than ten beats for you. Use a formula only as a starting point. Sports medical test. The most reliable option. You also get insight into your threshold heart rate and a gas analysis.
A maximal effort puts real demands on your heart. If you have heart symptoms or a medical condition, or you are new to exercise, have a max test supervised by a sports physician.
Step 2: measure your resting heart rate
For the Karvonen method you also need your resting heart rate. Measure it right after waking up on a few mornings in a row, while you are still lying down, and take the average. A single reading after a short night or a busy day gives a skewed picture.
Step 3: choose your method
There are two common ways to turn your heart rate into zones:
Percentage of max HR. You take the percentage from the table of your max HR. Simple, and enough if you only know your maximum heart rate. Karvonen (heart rate reserve). You work with the difference between your max HR and your resting heart rate: target heart rate = resting HR + percentage × (max HR − resting HR). Because your resting heart rate counts, this method tracks more closely how much oxygen your body is actually using. It gives more personal zones, especially for runners with a low resting heart rate.
With Karvonen, use the percentages from the heart rate reserve column, not the max HR column: 70% of your reserve is harder than 70% of your maximum.
Step 4: calculate your zones and test them
Take a runner with a max HR of 190 BPM and a resting heart rate of 55 BPM:
With % of max HR: zone 2 is 70–80% of 190, so 133–152 BPM. With Karvonen: the heart rate reserve is 190 − 55 = 135. Zone 2 is 60–70% of that: 55 + 0.60 × 135 = 136 and 55 + 0.70 × 135 = 150, so 136–150 BPM.
For this runner, the two methods land close together. The further your resting heart rate is from average, the more they differ.
You can also use the heart rate zones calculator. It labels your zones with the names from Jack Daniels' system: Easy (E), Marathon (M), Threshold (T), Interval (I), and Repetition (R). With the % of max HR method, Easy (65–79%) covers the top of zone 1 and zone 2, Marathon (80–89%) roughly matches zone 3, Threshold (88–92%) zone 4, and Interval (92–100%) zone 5. Repetitions are so short that your heart rate cannot keep up; you run those by pace. Read more about this system in Zones and Quality (VDOT).
Then test your zones for a few weeks. If you cannot talk in full sentences in zone 2, or zone 4 feels like an easy run, your max HR is probably off. Want to be more precise? Find your threshold heart rate too: after a warm-up, run 30 minutes on your own as hard as you can hold evenly, and take your average heart rate over the last 20 minutes.
Want to measure these values accurately while running? Read Using wearables to track your progress to see which watches and sensors measure most reliably.
04 · Zone 2 runningZone 2 running: what it is and how it feels
Zone 2 is the easy endurance zone where most of your miles belong. You run just below your first threshold: the point where your breathing gets noticeably deeper and faster and talking starts to take effort. In the table above, that is 70–80% of your max HR, or about 60–70% of your heart rate reserve. For the runner in the example, that works out to about 133–152 BPM with % of max HR, or 136–150 BPM with Karvonen.
What does zone 2 feel like?
In zone 2 you can talk in full sentences. You breathe more deeply than at rest, but you are not panting. That is more than a rule of thumb: research on the talk test shows that the moment talking stops feeling fully comfortable ("yes, but…") lies close to your first ventilatory threshold. As long as you can talk with ease, you are below it.
That makes the talk test a good check on your heart rate monitor. If your watch says zone 2 while you can barely finish a sentence, trust your breathing and slow down. On hot days, after a poor night's sleep, and late in a long run, your heart rate is often higher at the same pace.
Many runners find zone 2 surprisingly slow at first. Sometimes you need to walk a short stretch uphill to stay in it. That is normal, and it eases as your base grows. The Maffetone method takes this a step further, with a fixed ceiling of 180 minus your age.
Zone 2 on your watch
Not every watch or app uses the same limits. Garmin's manuals, for example, show a model in which zone 2 is 60–70% of your max HR, and 70–80% is already zone 3. Zone 2 on such a watch is easier than zone 2 in this article. So always compare the heart rates themselves, not just the zone number, and set your own limits when you follow a plan or article.
How often should you run in zone 2?
Well-trained endurance athletes do about 80% of their training at low intensity and the rest hard. For recreational runners, that is a useful guideline:
Running twice a week: one easy run in zone 2 and one workout with a harder block, or both easy if you are just starting out. Running 2 days a week shows how to fill a week like that. Three times a week: two easy runs, one of them a bit longer, and at most one harder workout. Four or five times a week: three or four easy runs, including a long run, and one or two quality workouts.
Keep your long run to roughly a quarter to 30% of your weekly volume. If you are new to running, do almost everything in zones 1 and 2 for the first few weeks; How to start running explains how to build up gradually.
05 · Build your aerobic baseThe best heart rate zones for building your aerobic base
Your aerobic base is your ability to keep running for a long time on energy your muscles release with oxygen. You build it mainly in zones 1 and 2. Easy running may not feel like much, but your heart is already working hard: according to Jack Daniels, at around 60% of your max HR it already pumps nearly as much blood per beat as it can. On top of that, more capillaries grow to your leg muscles, and your muscle fibers adapt so they take up more oxygen and convert more fuel.
Many of those adaptations depend on how long your muscles are working. The total of easy hours over weeks and months counts for more than any single hard workout. Here is how to build your base in practice:
Run more often or longer, not harder. Add an extra easy run first, or make your long run a little longer. Build up gradually. Plan a lighter week every 3–5 weeks with about 20% less volume, so your body can absorb the training. Keep zone 3 in check. One or two harder workouts a week help you progress, but too much "just a bit too fast" makes you tired without strengthening your base. Track your pace at the same heart rate. If you run faster at the same zone 2 heart rate after a few months, your base is growing.
The Lydiard method is built entirely around a base period like this. Want a buildup that fits your current level? Create a personal plan.
06Smart planning with heart rate
The real power of heart rate zones lies in how you distribute your week. Many runners train in zone 3 too often: an effort that is not easy enough to strengthen your base and not hard enough to improve your speed. By building your week smartly, you get more out of the same mileage.
Zones 1 and 2 (base). About 75–80% of your training time. Use zone 1 mainly for warm-ups, cool-downs, and recovery runs. Zones 3 and 4 (tempo/threshold). Most of the rest, usually in one or two workouts per week. Zone 5 (high). At most 10%, for example the repeats of an interval workout.
Polarized training goes a step further and largely skips zone 3. The speed workouts in Improve running speed: 6 proven methods show how to add zones 4 and 5 carefully and effectively.
Heart rate is a compass, not a verdict. Use it with pace, context, and effort.
07 · Example week (10K)Example week for a 10K runner
A training week works best when you combine different heart rate zones on purpose. That gives your body the right mix of base building, speed work, and recovery. The week below shows what a balanced plan can look like for someone training specifically for a 10K.
Or create your own personal plan.
Monday. Zone 2 easy run, 45 min Tuesday. 6 × 800 m intervals in zone 4 Wednesday. Zone 1 recovery jog, 20–30 min Thursday. 30 min tempo run (zone 3) Friday. Rest Saturday. Zone 2 long run, 75–90 min Sunday. Optional: 30 min zone 1 recovery run
08 · Evaluate your progressHow do you evaluate your progress?
Heart rate training only really works when you regularly check whether your body responds the way you expect. You do not need complex analyses or expensive tools: a few consistent signals already give a clear picture. By doing the same small checks every month (or even every week), you recognize patterns in your fitness, recovery, and endurance.
How do you measure progress?
Pace at a fixed heart rate. Can you run faster at 140 BPM than you did a month ago? Then your aerobic capacity has improved. This is one of the most reliable indicators of progress, as long as you compare similar conditions: a flat loop and no heat or strong wind. Recovery between blocks. Does your heart rate drop faster after an interval or hill block? Faster recovery means your heart is getting stronger and pumping blood more efficiently. Resting heart rate. A declining morning heart rate (averaged over weeks, not days) points to better base fitness and recovery. A rising resting heart rate can be a sign of fatigue, illness, or stress. Feel (RPE 1–10). How did a workout feel? Short notes such as "easy," "hard," "tired legs," or "great day" help you see patterns between sleep, stress, heart rate, and performance.
For more insight into how recovery works and why you should track it, read Sleep and recovery: impacting your performance.
09 · Zones and goalsZones and training goals
Each heart rate zone has its own purpose. When you understand why you run in a certain zone, you make more deliberate choices and structure your training with more focus. That prevents "gray zone" training: too hard to be real recovery, too easy to bring quick gains.
| Zone | Purpose of the workout | Examples |
|---|---|---|
| Zone 1 | Recovery, blood flow, calming the nervous system | Cool-downs, recovery runs, easy morning loops |
| Zone 2 | Base fitness, fat burning, efficient stride | Long run, easy runs, extensive aerobic blocks |
| Zone 3 | Rhythm, efficiency, aerobic power | Tempo run of 20–40 min, steady runs, marathon pace |
| Zone 4 | Raising your threshold, hard but controlled | 6 × 5 min hard, 20 min threshold run |
| Zone 5 | Maximum oxygen uptake, speed | Intervals of 2–5 min, hill repeats |
A balanced plan mainly includes zones 1–2, plus one or two harder sessions per week in zones 3–5, depending on your level and goal.
10 · Heart rate mistakesCommon mistakes in heart rate training
Heart rate training offers structure and objectivity, but it often goes wrong when you rely too much on the numbers or apply the zones incorrectly. The pitfalls below are classic, and easy to fix.
Relying only on numbers and ignoring how you feel. Heart rate responds to stress, temperature, sleep, and nutrition. RPE remains your most important compass. Basing zones on the wrong max heart rate. The 220 − age formula is too imprecise. A field test or long blocks at high intensity give better data. Training too much in zone 3 (the "gray zone"). You recover poorly, but you do not really improve either. The result: tired, but not faster. Copying other people's heart rate numbers. Heart rate is individual. What is "high" for someone else may be normal for you. Mixing up zone numbers from different systems. Zone 2 on your watch may have different limits than zone 2 in your plan. Look at the heart rates, not just the number. Skipping recovery weeks. Without a lighter week every 3–5 weeks (about 20% less volume), fatigue builds up and your progress stalls.
Avoid these pitfalls and heart rate training becomes a clear system: you train easier where you should, harder where you can, and you see results faster.
11 · FAQFrequently asked questions
Summary & next step
Heart rate zones give structure to your training. Find your max heart rate and, optionally, your resting heart rate, calculate your zones, and run most of your volume easy in zones 1 and 2. Add tempo and threshold sessions when you are rested, and you will build strong, lasting fitness.
👉 Want this applied to your level? Enter your age, recent times, and weekly volume for a personal plan.
