Cardio zones aren't real—not in the way your fitness app makes them sound, anyway. Yes, heart rate zones are a way to describe how hard you're working during a cardio workout, like running or cycling. But the cardio zones everyone's always buzzing about are just a way of bucketing exercise intensity into digestible categories. They're a useful shorthand, but there are no physiological lines in the sand where your body suddenly switches from "zone 2" to "zone 3." It's a spectrum, and the specific cutoffs vary depending on who you ask (or what app you're using), what formula they rely on, and whether they measured your lactate threshold in a lab or just guessed based on your age.
"Zero" sounds like nothing, or if not "nothing," then at best, it sounds like rest. But rest is already informally called "zone 1" in many popular frameworks (never mind that it's arguably not a real zone, since sitting still is in no way a cardio zone). So, we now have zone zero slotted below zone 1 (rest), which means we've invented a category below doing nothing.
Strip away the branding, and zone zero is a way to call out the sort of movement that falls between "workout" and "total inactivity." This might mean your 10-minute walk after lunch, taking the stairs instead of the elevator, or pacing while on a phone call. These movements might not register as strict exercise, but cumulatively, across a day—across a life—they can make a real difference.
Who zone zero cardio is for
Armed with this understanding of what zones are and are not, zone zero can be a great framework. For instance, if you're an all-or-nothing exerciser, then zone zero is a way to remember that light movement still counts for something. Or if you're someone recovering from injury, illness, or burnout, or for whatever reason structured cardio isn't accessible to you right now, then zone zero is a great way to remember that you haven't failed by not hitting the gym. Gentle movement—even the kind that barely registers on a heart rate monitor—is still movement, and it still has value.
The best fitness trackers for tracking your zones
If you want to monitor cardio intensity—whether that's the coveted zone 2 work, harder efforts, or just making sure you're moving enough throughout the day—here are the trackers that do it best:
Garmin Forerunner 570
Garmin's heart rate zone tracking is among the most accurate on the market for wrist-based monitors, and as my colleague Beth Skwarecki writes in her review, the Garmin Forerunner 570 has shockingly good heart rate accuracy. Unfortunately, the price (currently on sale for $496.97) might be a dealbreaker for casual users.
Garmin Forerunner 570 $496.97 at Amazon $549.99 Save $53.02 Get Deal Get Deal $496.97 at Amazon $549.99 Save $53.02Apple Watch Series 10
This is the best Apple Watch for most people, and it gets the job done for most people's heart rate zone tracking. Plus, it's the most seamless option if you're already in the Apple ecosystem.
Apple Watch Series 10 $392.09 at Amazon $429.00 Save $36.91 Shop Now Shop Now $392.09 at Amazon $429.00 Save $36.91Fitbit Charge 6
When it comes to heart rate, the Fitbit is a perfectly solid budget option. If you want more than a minimalist approach, you might find yourself longing for a proper fitness watch, like the Garmin or Apple options above.
Fitbit Charge 6 $146.99 at Amazon $159.95 Save $12.96 Shop Now Shop Now $146.99 at Amazon $159.95 Save $12.96The bottom line
To put it bluntly: You don't need to track so-called "zone zero" cardio. You don't need a new metric for it, a dedicated workout, or a wearable that vibrates to remind you to stand up (though your existing wearable might already do that, and it can certainly be useful). The whole point is that it's supposed to be below the threshold of effort.
What is worth taking seriously is the underlying behavior change this concept encourages. Take a look at your day and honestly ask yourself whether movement is woven through it, or confined to a scheduled block. If it's the latter, consider incorporating some walking and stretching breaks into your day. Maybe zone zero didn't need a name, but now it has one, and if knowing about it helps you move more, that's a win.
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