Zone 2 training is still having a moment—even if no one can agree on what it actually means. Legend has it that your easy, conversational-pace cardio—aka your Zone 2 heart rate—is the secret to unlocking everything from a bigger aerobic engine, to faster race times, and even to a longer life.
Whether Zone 2 deserves quite this much hype is debatable, but still, there are plenty of good reasons to master heart rate training more broadly. To train by heart rate, you aim to keep your heart rate in the "zone" that gives you your desired workout. Even if you believe every word of the Zone 2 gospel, it's completely pointless if your watch has the wrong idea of what your Zone 2 is. If you train with a Garmin watch, here’s how—and why—you should reset your heart rate zones now (and periodically).
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Percent of max heart rate. This is the simplest approach. You enter (or let the watch estimate) your max, and each zone is a slice of that number. It's only as good as your max heart rate figure, which, as noted above, is often a guess.
Percent of lactate threshold heart rate (LTHR). Here, your zones are anchored to the effort level where your body starts producing lactate faster than it can clear it, a point that's closely tied to how you actually perform. Many coaches consider this the most meaningful anchor, because it reflects your real physiology rather than a formula.
Do you need to take Garmin’s lactate test?
In the past, getting a lactate threshold estimate from a Garmin meant wearing a compatible chest strap and doing a guided test, which involved a structured, hard run on your part. On newer models, however, that's no longer the case. Garmin has been rolling out an updated lactate threshold detection that works from the wrist's optical heart rate sensor, with no chest strap and no dedicated test. Instead, the watch estimates your threshold automatically from regular outdoor runs. This feature is typically on by default and generally requires a baseline VO2 max estimate and a run or trail run recorded with heart rate. If you'd rather not leave it up to the algorithm, you can turn auto-detection off and enter your own lactate threshold heart rate manually in the heart rate zone settings. Which watches have this varies by model, so check your specific device.
Your fitness changes. As you get fitter, your resting heart rate often drops, and your lactate threshold heart rate can shift. Zones based on where you were a year or two ago may not reflect where you are now.
You change sports. Running, cycling, and swimming each have different heart rate behavior, and Garmin lets you set sport-specific zones for exactly this reason. If you've never touched them, you may be using running-based numbers on the bike, or vice versa.
Your resting heart rate has changed. An outdated resting number could be throwing things off.
On the flip side, if your zones are set too low, your "easy" runs could actually become the classic trap of training in the gray zone: too hard to recover from well, too easy to drive big gains. And because Garmin's training status, recovery time, and load features lean on your heart rate data, bad zones can quietly nudge those numbers off as well.
How to update your Garmin heart rate zones
The informal way is to just notice what number you see on your watch when you can no longer speak comfortably; the more formal way is this treadmill test. You can also look through your recent hard efforts, like races, hill repeats, or all-out intervals, and see the highest sustained heart rate you've recorded. If you want a more deliberate test, a coach or a structured max-effort protocol can help, but only attempt hard testing if you're healthy and your doctor is comfortable with it. Also keep in mind that reading from a wrist-based sensor can also spike unreliably, so a chest strap gives more trustworthy numbers when accuracy matters.
In your watch's user profile or in Garmin Connect, find the heart rate zone settings. From there you can adjust your max, change how zones are calculated, and set different zones for different sports.
The bottom line
Maybe Zone 2 is the cornerstone of your training, or maybe you think it's completely overrated. Either way, the principle is the same: You should be able to train by feel, and your watch can only help you do that if the numbers behind it are right.
Garmin gives you more ways to set your zones than most brands do. Spend 10 minutes figuring out which method your zones are using, confirming the number behind it is current, and updating it in your settings. It’ll make every easy run, hard interval, and recovery metric on your wrist more useful.
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