Running Heart Rate Zones: 4 Runs for Smarter Training

Not all runs are created equal. Or perhaps I should say, not all runs are meant to be executed the same way.

I've been a runner since middle school, when I first discovered running by participating in my hometown's track races each summer. Back then, I had no race strategy and I didn't know what "peaking" meant. I didn't wear a GPS watch and I didn't know my pace.

Today I'm a little wiser thanks to the coaches, doctors and physical therapists who have educated me on proper running form and helped me overcome various injuries and frustrating training plateaus. With 16 years of running experience under my belt, I've learned the hard way that success comes down to the numbers and the science behind the art of running, but not necessarily how I feel about my body.

I've had days where I wake up and feel like garbage, but then I set a personal record in my race. Oftentimes, pre-race nerves and our own self-doubt cloud our ability to trust our fitness gains.

What Are Running Heart Rate Zones?

Running heart rate zones split your effort into five intensity ranges, each tied to a specific physiological adaptation. WHOOP calculates these zones using Heart Rate Reserve (HRR), the gap between your maximum and resting heart rates, which produces a more personalized read than the older percentage-of-max method. Training by zone turns every run into a deliberate session: an easy day stays easy, a threshold day pushes the right system, and recovery is protected.

Why heart rate zones matter

Most runners default to pace or perceived effort. Both are useful, but neither accounts for how your body is responding on a given day. Heart rate zones add an objective measure of cardiovascular load, and HRR-based zones go further by factoring in your Resting Heart Rate. That matters because two runners with the same age and HR Max can have very different fitness levels, and therefore different responses to the same workload. Structuring your week around HRR zones, paired with daily Recovery, helps you decide when to push, when to hold back, and when to rest.

How heart rate zones work

A heart rate zone is a range of beats per minute tied to a portion of your aerobic capacity. The older approach used percentage of HR Max alone (for example, 70-80% of your peak heart rate). The current standard, and the method WHOOP uses, is percentage of Heart Rate Reserve.

HRR equals HR Max minus your Resting Heart Rate. WHOOP sets your zones as percentages of that reserve and adds them back to your Resting Heart Rate (the Karvonen formula). For example, a runner with an HR Max of 195 and a Resting Heart Rate of 50 has an HRR of 145. Their Zone 2 lower bound (60% HRR) lands at 50 + (145 × 0.60), or 137 bpm.

HRR zones reflect individual fitness. A trained runner with a lower Resting Heart Rate gets a wider, more sensitive zone range than someone with a higher RHR but the same HR Max. Two athletes can hit the same bpm and be in completely different zones.

How to find your heart rate zones

Accurate zones start with two numbers: your HR Max and your Resting Heart Rate.

For HR Max, the "220 minus age" formula is a rough estimate and can be off by 10-20 bpm. A more accurate method is a field test (a controlled all-out effort, such as a treadmill ramp or 800m repeats with a final hard finish) or pulling your peak heart rate from past max-effort workouts.

For Resting Heart Rate, WHOOP measures it nightly during sleep, when external stressors are minimized. This produces a reliable baseline that updates as your fitness changes.

WHOOP auto-detects your HR Max from your training data and uses your nightly RHR to calculate HRR. You can adjust HR Max manually if you have a more accurate value from a lab test or recent race. For step-by-step instructions, visit the Adjusting and Calculating Max Heart Rate and Heart Rate Zones support article.

The five heart rate zones for training

WHOOP uses five HRR-based zones. Each one trains a different system.

Most coaches recommend an 80/20 split: 80% of weekly mileage in Zones 1-2, 20% in Zones 3-5. This polarized approach builds durability without overloading the high-intensity systems.

4 essential runs to train in every zone

The four runs below cover every zone and form the backbone of a competitive training week. Volume and pace should match your level (for newer runners, working with a coach or local club is a worthwhile investment).

1. The long run (aerobic base building)

Training Zone: Zone 2 (Aerobic)My pace: 7:30-8:00/mileThe workout: 12 miles at recovery pace

The long run is the foundation. Mine sits at roughly 25% of weekly mileage; running 45-50 miles per week, my long runs are typically 11-13 miles.

These should feel relaxed. You should be able to hold a light conversation throughout. They build endurance, train fat oxidation, and teach pacing patience.

The chart below shows a 90-minute long run with an average heart rate of 139 bpm, sitting cleanly inside Zone 2. The WHOOP data confirms the zone distribution, which matters because what feels "easy" can drift higher than intended without objective feedback.

Heart rate data from a long run, via the WHOOP web app.

2. Speed intervals (VO2 max development)

Training Zone: Zone 5 (VO2 max)My pace: 4:00-6:00/mile (depending on interval length)The workout: 2 minutes rest between intervals, 5 minutes rest between sets

• 4x mile repeats: 6:01, 5:58, 5:55, 5:59
• 4x 400m: 75s, 74s, 73s, 75s

Note: volume and pace depend on your goal race. This workout was built for a 5k.

Speed intervals push you into Zone 5, where lactate accumulates quickly and recovery between efforts is short. This is the zone that develops VO2 max and leg turnover.

Most bodies tolerate 1-2 of these workouts per week. I cap mine at one, since recovery takes 3-4 days. The peaks in the heart rate trace below correspond to each interval.

3. The progressive run (lactate threshold)

Training Zone: Zone 4 (Lactate threshold)My pace: 6:30-6:10/mileThe workout: 4-mile tempo starting at 6:30/mile, cutting down to 6:10/mile

The goal here is hard but controlled. You're running at the edge of what your body can clear, not past it. My heart rate typically sits in the 160-170 bpm range during these.

These are the trickiest workouts to execute. The temptation is to push faster, but going past threshold compounds recovery cost and undercuts the next session. I start at 6:30-6:40/mile and finish around 6:20/mile.

A progressive run during which heart rate elevates toward the end.

This is not race pace, and it shouldn't feel like one. Checking heart rate and Strain mid-workout keeps the effort honest. My WHOOP data captures the warm-up, then the climb into the 160s as the pace drops.

4. Race day (peak performance)

Training Zone: Zone 5 (VO2 max)My pace: 5:45-5:55/mileThe race: Local 5kTime: 18:24Pace: 5:55/mile

Elevated heart rate close to max while running a race.

Race day either weighs on you or lifts you. If the work is in, there's nothing to fear. The data below is from a 5k I ran in Boston.

Looking at the heart rate trace, I had a few more bpm in the tank. Effort-wise the race felt strong, and it was a solid opener for the cross-country season.

The biggest mistake a runner can make is treating every run the same. Same pace daily means no adaptation. Constantly elevated zones mean burnout. Monitoring heart rate and Recovery, day by day, keeps the cycle balanced. WHOOP calculates a daily Recovery score from sleep-stage HRV, Resting Heart Rate, and respiratory rate, which signals when your body is ready to push and when it needs a lighter day.

How WHOOP personalizes your training

Zones are only useful if they reflect you. WHOOP builds zones from your individual HR Max and nightly Resting Heart Rate, recalculates HRR as your fitness shifts, and pairs zone data with a daily Recovery score so you can match intensity to readiness.

With the WHOOP app, you can see:

• Time spent in each HRR-based heart rate zone during every run.
• Daily Recovery to guide whether to push higher zones or hold back.
• Trends in Resting Heart Rate and HRV, which reflect aerobic fitness gains.
• Sleep performance, including REM and Slow Wave Sleep, which drives recovery from hard sessions.

This is the layer most runners miss. Zones tell you what you did. Recovery tells you what you should do next. Together, they take the guesswork out of weekly planning. WHOOP handles most of the calculation for me; I use the data to confirm I'm executing the plan and to add a rest day when my body is asking for one.

Train smarter, recover faster

Heart rate zone training moves you past mileage logging and into deliberate adaptation. Every run earns its place: aerobic base in Zone 2, threshold in Zone 4, peak speed in Zone 5. Paired with WHOOP Recovery, the cycle becomes self-correcting.

Frequently asked questions about running heart rate zones

Which heart rate zone should I be in when running?

It depends on the purpose of the run. Easy mileage and long runs belong in Zones 1-2 (50-70% HRR). Tempo and threshold work sits in Zone 4 (80-90% HRR). Speed intervals push into Zone 5 (90-100% HRR). For most runners, 80% of weekly mileage should sit in lower-intensity zones.

Is 170 bpm a good heart rate while running?

It depends on your HR Max and Resting Heart Rate, which together determine your HRR-based zones in WHOOP. For a younger runner with an HR Max of 195 and a low RHR, 170 bpm may fall in Zone 4. For someone with a lower HR Max, the same number could land in Zone 5. The bpm only means something relative to your personal zones.

What if my heart rate is too high or too low during a run?

A higher-than-expected heart rate for a given pace can signal fatigue, dehydration, illness, or under-recovery. WHOOP Recovery often flags this before the run starts. A lower-than-expected heart rate during a hard session may mean you're not pushing enough to trigger the intended adaptation. Use the live zone display in the WHOOP app to adjust effort during the run itself.

WHOOP is not a medical device and does not provide medical advice, diagnosis, or treatment. Always consult your healthcare provider for medical concerns.

Allison Lynch is a member of the Boston North Track Club, a competitive USATF New England sprint and mid-distance group that competes regionally and nationally. She has competed in distances including the marathon, half-marathon, 5k, mile, and 800m.