Many riders train at the same "moderately hard" effort on every ride, then wonder why they stop improving. Heart rate zones are the simplest way to fix that. They help you ride genuinely easy when the plan says easy, and genuinely hard when it says hard, using nothing more than a heart rate monitor.

This guide explains the standard five-zone model, how to estimate your maximum heart rate, how to structure a week around zones and which kind of heart rate monitor to use. Zone percentages come from Garmin's published heart rate zone table (as used on its Edge bike computers). Monitor specs come from manufacturers' manuals and product pages, checked in October 2026. It is general training information, not medical advice. If you have a heart condition or other health concerns, talk to a doctor before training hard.

What heart rate zones are

A heart rate zone is a range of heartbeats per minute that corresponds to a level of effort. Garmin's Edge 1050 manual describes five commonly accepted zones, numbered 1 to 5 by increasing intensity, and generally calculated as percentages of your maximum heart rate.

Training by zones matters because different intensities stress your body in different ways. Easy riding builds aerobic endurance and lets you recover; threshold and very hard efforts raise your ceiling but cost more recovery. Without zones, most riders drift into the middle and get a bit of everything without enough of anything.

Most bike computers and apps let you set zones in three ways. Garmin, for example, lets you base them on:

• % of maximum heart rate (% Max);
• % of heart rate reserve (% HRR) — maximum minus resting heart rate;
• % of lactate threshold heart rate (% LTHR).

This guide uses % of maximum heart rate because it is the simplest to start with.

The five zones

Garmin's Edge 1050 owner's manual publishes this table:

Here is what those zones look like for a rider with a maximum heart rate of 180 bpm:

Other coaches and apps use slightly different boundaries, and some use six or seven zones. That's fine: what matters is that you use one system consistently.

Zone 1: recovery

The easiest zone. Use it for recovery rides after hard days and for the first and last 10–15 minutes of a session. If it feels almost too easy, it's probably right.

Zone 2: endurance

The comfortable, conversational zone, where Garmin notes conversation is possible. Most of a typical endurance rider's time is spent here: long, steady rides that build aerobic fitness without much fatigue. The common mistake is letting heart rate creep up on climbs; ease off to stay in the zone.

Zone 3: tempo

A moderate pace where conversation gets harder. It's useful for steady climbs and sustained efforts, but many riders spend too much time here by accident, because it feels productive without being either truly easy or truly hard.

Zone 4: threshold

Fast and a bit uncomfortable, with forceful breathing. Threshold intervals, such as 2 × 20 minutes with easy riding between, are a staple of structured training.

Zone 5: maximum

Very hard, unsustainable efforts: short intervals and sprints. Heart rate responds slowly to very short efforts, so for efforts under a minute or two, effort or power is a better guide than heart rate.

How to estimate your maximum heart rate

Every %-of-max zone depends on your maximum heart rate, so it's worth getting this number roughly right.

220 minus age. Garmin uses this as its default maximum heart rate. It's simple but only an average: individuals of the same age can differ widely.

Tanaka formula. Tanaka, Monahan and Seals (2001) proposed 208 − 0.7 × age. For a 35-year-old that gives about 184 bpm, against 185 bpm from 220 − age. The difference between formulas grows with age.

Observed maximum. The highest heart rate you see during genuinely all-out efforts, such as the end of a hard climb or a race finish, is often a better personal guide than any formula. Garmin devices can also auto-detect heart rate values during activities and update your zones.

A practical approach:

1. Start with a formula-based maximum.
2. Ride with those zones for a few weeks.
3. If your recorded peak heart rate during hard efforts is consistently higher than the formula estimate, raise your maximum and recalculate your zones.

If you have health concerns, don't attempt a maximal effort without medical clearance.

Lactate threshold and heart rate reserve

Percentage of maximum is easy to understand, but two other methods can be more personal.

• Lactate threshold heart rate (LTHR) is roughly the highest heart rate you can sustain for an extended hard effort. Basing zones on LTHR ties them to a performance marker rather than an absolute maximum. Garmin's Edge computers let you enter your LTHR, and the auto-detect feature can update heart rate values during activities.
• Heart rate reserve (HRR) uses the difference between maximum and resting heart rate. It accounts for riders with unusually low resting heart rates.

If you choose one of these methods, set it in your device or app and keep using it, so your training history stays comparable.

How much time to spend in each zone

Research on how endurance athletes distribute their training (for example, Seiler's 2010 review in the International Journal of Sports Physiology and Performance) found that successful endurance athletes typically spend most of their training time at low intensity, with a smaller proportion at high intensity. This is often summarised as roughly 80% easy and 20% hard.

For a recreational road cyclist, that translates to:

• most rides in zones 1–2, kept genuinely easy;
• one or two hard sessions a week in zones 4–5;
• zone 3 used deliberately (for example on steady climbs), rather than by default.

A sample week (about 8 hours)

Most of the week is zone 1–2 riding, with two focused hard days. Every three or four weeks, consider an easier week with reduced volume. Adjust the plan to your available time and fitness; the structure matters more than the exact durations.

Choosing a heart rate monitor

Chest straps measure the heart's electrical signal and are the usual choice for structured training. Examples, with manufacturer specs:

Optical sensors (on the arm or wrist) shine light into the skin to detect blood flow. They're convenient and comfortable for steady rides. Chest straps are generally preferred for interval training, where heart rate changes quickly.

Practical tips:

• Wet the strap's electrodes before riding, as Garmin advises for erratic readings, and warm up for 5–10 minutes.
• Pair your monitor over ANT+ if you want it to broadcast to a bike computer and a watch at once.
• Rinse straps after use; Polar notes that moisture can keep the H10 active and drain its battery.

Setting zones on your bike computer

On a Garmin Edge, open My Stats > Training Zones > Heart Rate Zones. Enter your maximum, lactate threshold and resting heart rate, then choose whether zones are based on % Max, % HRR or % LTHR. Add a heart rate zone field to your training data screen so you can see your zone at a glance.

Common mistakes

1. Riding in zone 3 all the time. It feels productive but isn't easy enough for recovery or hard enough for the biggest gains. Keep easy rides easy.
2. Ignoring zone 2 because it feels slow. Heart rate is the guide, not speed. Slow down on climbs to stay in the zone.
3. Stacking hard days. Two hard sessions a week is plenty for most riders. Add more only if you're recovering well.
4. Using the wrong maximum. If zone 2 feels hard or zone 4 feels impossible, your maximum heart rate estimate may be off. Revisit it.
5. Chasing heart rate on short sprints. Heart rate lags behind very short efforts; use effort or power for sprints.

Frequently asked questions

What are the five cycling heart rate zones?

Using Garmin's published table: zone 1 is 50–60% of maximum heart rate, zone 2 60–70%, zone 3 70–80%, zone 4 80–90% and zone 5 90–100%.

How do I calculate my maximum heart rate?

Common formulas are 220 minus your age (Garmin's default) and Tanaka's 208 − 0.7 × age. Your highest observed heart rate during all-out efforts is often a better personal guide.

What is zone 2 training?

Riding at about 60–70% of maximum heart rate on Garmin's scale: a comfortable pace where conversation is possible. It's the main zone for endurance rides.

How much time should I spend in each zone?

Many endurance athletes spend most training time at low intensity and a smaller share at high intensity, often summarised as about 80% easy and 20% hard. For most cyclists that means mostly zone 1–2 riding plus one or two hard sessions a week.

Chest strap or optical monitor?

Chest straps measure the heart's electrical signal and are generally preferred for intervals. Optical arm sensors are convenient and fine for steady endurance riding.

Should I use heart rate or power?

Both are useful. Heart rate shows how your body is responding, while power shows the work you're producing. Heart rate is a great, affordable starting point, especially for endurance rides.

The bottom line

Pick one zone system, set your zones from a sensible maximum heart rate estimate and use them consistently. Keep easy rides in zones 1–2, make one or two sessions a week genuinely hard, and review your maximum after a few weeks of training. A chest strap and a bike computer are all you need to start.

Sources

• Garmin Edge 1050 owner's manual (heart rate zones and zone table)
• Tanaka H, Monahan KD, Seals DR. Age-predicted maximal heart rate revisited. J Am Coll Cardiol 2001;37:153–156.
• Seiler S. What is best practice for training intensity and duration distribution in endurance athletes? Int J Sports Physiol Perform 2010;5:276–291.
• Garmin HRM 600 specifications and Polar H10

Equipment mentioned in this guide

• Garmin HRM 600 heart rate monitor
• Polar H10 heart rate sensor
• Wahoo TRACKR heart rate monitor

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