Heart Rate Zones Explained: Training Smarter, Not Harder
Heart rate zones are ranges of beats per minute, expressed as percentages of your maximum heart rate, that mark out different exercise intensities. Five bands, one maximum. Training inside a particular band targets a particular adaptation — recovery at the bottom, endurance in the middle, speed and lactate threshold near the top. The post works from a maximum heart rate commonly estimated as 220 minus your age, then divides the range into five: recovery, fat burn, aerobic, anaerobic and maximum. Its practical point is that most people train too hard in the middle. The post puts the bulk of training time in zone 2, where a conversation is still possible.
What Are Heart Rate Zones?
Heart rate zones are ranges of heartbeats per minute that correspond to different exercise intensities. Training in specific zones allows you to target different physiological adaptations, from fat burning to cardiovascular endurance.
Your zones are calculated based on your maximum heart rate (MHR), commonly estimated as 220 minus your age.
The Five Heart Rate Zones
Zone 1: Recovery (50-60% MHR)
Light activity like walking or gentle stretching. This zone promotes recovery and is ideal for warm-ups and cool-downs. You can easily hold a conversation.
Zone 2: Fat Burn (60-70% MHR)
Moderate activity where your body primarily uses fat as fuel. This is the foundation of endurance training. Brisk walking, easy cycling, or light jogging fall here. Most of your training time should be in Zone 2.
Zone 3: Aerobic (70-80% MHR)
Moderate-to-hard effort that improves cardiovascular efficiency. You can speak in short sentences but not hold a full conversation. Running at a comfortable pace or cycling with moderate effort fits this zone.
Zone 4: Anaerobic (80-90% MHR)
Hard effort that builds speed and lactate threshold. You can only say a few words at a time. Tempo runs, fast cycling intervals, and competitive sports push you into this zone.
Zone 5: Maximum (90-100% MHR)
All-out effort sustainable for only 30-60 seconds. Sprints and high-intensity intervals reach this zone. Use sparingly to avoid overtraining.
How to Use Zones for Your Goals
Weight loss: Spend 70-80% of training time in Zone 2, with occasional Zone 3-4 intervals.
Endurance: Build a strong Zone 2 base. The 80/20 rule suggests 80% easy effort (Zone 1-2) and 20% hard effort (Zone 3-5).
Performance: Structured interval training alternating between Zone 4-5 efforts and Zone 1-2 recovery.
Calculating Your Zones in LifeWell
Use the heart rate zone calculator in LifeWell's Tools section:
- Enter your age and resting heart rate
- The calculator generates your personalized zones
- Save your zones for reference during workouts
- Track which zones you hit during exercise sessions
Tips for Accurate Monitoring
- Measure resting heart rate first thing in the morning before getting out of bed
- Use a chest strap for the most accurate readings during exercise
- Account for medications like beta-blockers that affect heart rate
- Retest periodically as your fitness improves
Elsewhere on LifeWell
- Privacy — What LifeWell stores, where it sits, and who can read it back.
- Plans — What the free plan includes, and what each paid one adds.
- Export everything — Your whole record leaves in one file, on any plan, without giving a reason.
What people use it for
Keeping the resting rate that everything else is read against
`/health/heart-rate` holds resting and recorded rates over time, entered by you. The post asks for the resting figure first thing in the morning before getting up, which is the one measurement condition that makes the number comparable week to week.
Working the bands out once
The heart rate zones card on the `/tools` directory is one of the cards marked leaving the site. Enter your age and resting rate, get the five bands, and write them where you will see them during a session. Once is enough. They only move when your resting rate does.
Timing intervals without a second app
`/tools/interval-timer` runs the work and rest periods the post describes for zone 4 and 5 sessions, with the recovery deliberately as long as the effort.
Logging the session, not only the number
`/exercise` holds what you did — yoga, strength, cardio — so a resting rate that drifts down over three months sits beside the training that might explain it.
Re-checking as fitness changes
The post's last tip is to retest periodically, because the resting rate that defined your bands moves. A record of resting rates over a year is what makes "periodically" a decision rather than a guess.
Questions
How are heart rate zones calculated?
From your maximum heart rate, which the post says is commonly estimated as 220 minus your age. The five bands are then percentages of it: 50 to 60 per cent for recovery, 60 to 70 for fat burn, 70 to 80 aerobic, 80 to 90 anaerobic, and 90 to 100 for maximum effort. The post presents 220 minus age as an estimate, which is what it is.
Does LifeWell read my heart rate from a watch or a chest strap?
No. `/health/heart-rate` holds resting and recorded rates over time, entered by you. There is no wearable integration, no sensor, and no automatic capture of a session's zones — if a figure is in your record, you put it there. The post recommends a chest strap for accuracy during exercise; LifeWell will store what it tells you, not read it.
Which zone should I train in most?
Zone 2, the post says: the band where fat is the main fuel and a conversation is still possible, and the base everything else is built on. For endurance it quotes the 80/20 rule — roughly 80 per cent of time easy in zones 1 and 2, 20 per cent hard in zones 3 to 5.
How do I find my resting heart rate?
First thing in the morning, before getting out of bed, and repeated so you have more than one reading — that is the post's method. Log it on `/health/heart-rate` and the page shows the readings over time, which is the only form in which a resting rate tells you anything — a single morning is noise.
Do medications affect my zones?
Some affect heart rate, beta-blockers among them, and the post says the estimate should account for it. That is a conversation for whoever prescribed them: LifeWell does not know what you take, does not adjust a band for it, and offers no view on whether a reading is expected or not. Nothing here is a diagnosis.
Where is the heart rate zone calculator?
On the `/tools` directory, as a card that opens ZTools and is marked as leaving the site. That split is deliberate and recorded: stateless calculators live on ZTools, and LifeWell keeps the tracking and the personal record. Re-implementing the calculator here would duplicate one that already exists.
By Ahsan Mahmood · updated 2025-07-13
Open Heart Rate Zones Explained: Training Smarter, Not Harder on LifeWell