The walking pad is the most successful piece of home fitness equipment of the last few years, and the pitch that sells it is the Zone 2 pitch: keep it under your desk, walk while you work, accumulate an hour of easy aerobic work a day without carving out a separate training slot.
Sometimes that's exactly what happens. Sometimes you spend an hour at 3 km/h answering Slack messages, your heart rate never leaves the 80s, and you've done something useful for your step count and almost nothing for your aerobic base.
The difference matters, because Zone 2 is the training that's supposed to build your mitochondria, your fat oxidation and your aerobic base — and it only works if you're actually in the zone. This post covers what Zone 2 actually requires, whether an indoor walk can meet it, the numbers that decide it for you, and how to verify it with your watch instead of guessing.
TL;DR: Whether a walking pad counts as Zone 2 depends entirely on your fitness and the speed and incline you can hold. The research-backed benchmark for "moderate intensity" is a cadence of about 100 steps per minute, which for most adults means roughly 4–5 km/h — and many walking pads top out around there, which is why the answer is genuinely borderline. For people in their 40s and up, or anyone with a moderate fitness level, a brisk flat indoor walk at 4.5–5.5 km/h often does land in Zone 2. For a trained runner or cyclist under 40, the same walk is usually Zone 1. Two fixes work: add incline (a 4–6% grade can move you a full zone) and don't hold the desk rail, which measurably lowers the effort. Walking pads are excellent for step volume, sedentary-time reduction and Zone 2 for beginners; they're a poor substitute for long Zone 2 rides or runs if you're already fit. Your Apple Watch won't generate a VO2 max estimate from an indoor walk, so use heart rate and the talk test instead.
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First, what Zone 2 actually requires
Zone 2 gets treated as a specific heart rate number, which is how most of the confusion starts. It isn't a number, it's an intensity: the highest effort you can sustain while your body is still predominantly using fat and oxygen, below the first lactate threshold — the point where lactate starts accumulating faster than you can clear it.
The practical markers are:
- You can hold a full conversation. Not a word, not a sentence — a conversation, without gasping between sentences. If you're doing the talk test properly, that's your Zone 2.
- Your heart rate sits roughly at 60–70% of your maximum, which is a wide band, not a precise target.
- It feels easy. Slightly bored, honestly. If you need music to push through, you're probably above it.
That last point is what makes the walking pad question interesting. Zone 2 is supposed to feel easy, and walking is easy — so surely walking counts? It does, if walking is hard enough for you. That's the entire hinge of the answer.
The benchmark that decides it: 100 steps per minute
There's a well-established heuristic in walking research: a cadence of about 100 steps per minute corresponds to minimally moderate intensity — the 3 MET threshold. Work by Tudor-Locke and colleagues in the CADENCE-adults study pinned this down across age groups, and Harvard Health's coverage of walking pace research lands in the same place: around 100 steps a minute is what "brisk" actually means in measurable terms.
That matters because "brisk" is the word everyone uses and nobody defines. In practice, 100 steps per minute translates to roughly 4–5 km/h for a typical adult stride length. And it's worth noticing something about the walking pad market: many popular under-desk models top out around 4–6 km/h. In other words, the top end of a lot of walking pads sits right at the boundary of moderate intensity. Which explains why people have wildly different experiences with the same product.
There's also a mechanical reality worth naming. Walking on a pad tends to shorten your stride compared with outdoor walking, especially under a desk where you're trying to keep your body stable in front of a keyboard. A shorter stride means lower speed for the same cadence, which means less work. Adding the distraction of typing usually costs you a bit more still.
So does it count? It depends on who you are
This is the honest answer, and it splits cleanly along two lines: your age and your fitness.
For a rough frame, here's what 60–70% of estimated maximum heart rate looks like by age — the range usually labelled Zone 2:
| Age | Estimated max HR (220 − age) | Approx. Zone 2 (60–70% max) |
|---|---|---|
| 30 | 190 | 114–133 bpm |
| 40 | 180 | 108–126 bpm |
| 50 | 170 | 102–119 bpm |
| 60 | 160 | 96–112 bpm |
Two caveats before you build anything on that table. First, 220 − age is a population average, not your maximum — individual max heart rates can sit 10–15 bpm either side. If you want a real number, find your true max heart rate rather than trusting the formula. Second, heart rate ranges should always be a cross-check on feel, not a replacement for it.
Now put a brisk walk on top of that table. A 45-year-old walking at 5 km/h on a flat pad will typically see something in the 100–115 bpm range. That sits inside or right at the bottom of their Zone 2. Encouraging.
A 30-year-old who runs three times a week and has a resting heart rate in the low 50s will see maybe 85–95 bpm at the same speed. That's Zone 1 — genuinely easy, useful for recovery and step volume, but not a Zone 2 stimulus. Their heart is efficient enough that walking barely registers as training.
Age helps explain why two people can describe the same walking pad so differently.
The two fixes that actually work
If your indoor walk isn't landing in Zone 2, you don't need a new pad or a better workout plan. You need more load from the same piece of equipment.
1. Add incline. Grade is the single most effective lever you have. Walking at 5 km/h on the flat might produce a heart rate of 95 bpm; the same speed at a 5–6% incline commonly adds 15–25 bpm, which is often a full zone. This is why treadmill-and-incline-walking protocols show up in so much fitness research. The catch is that most cheap walking pads are flat, or have limited or fixed incline — which is the biggest practical limitation of the category. If you're choosing between models and zone training is your goal, incline capability is worth more than top speed.
2. Stop holding the rail or desk. Resting your hands on the desk or gripping the handrail offloads your body weight and measurably reduces the energy cost of the walk — lower heart rate, lower oxygen consumption. It feels harmless because it's comfortable. It's one of the fastest ways to turn a moderate-intensity session into a soft one. If you need the desk for balance, slow down and walk unassisted, or accept that a typing-while-walking session is closer to NEAT than to structured Zone 2 work.
Optional third lever: speed. If your pad goes to 6 km/h and you can hold it, use it. But there's a ceiling here — walking speed tops out before stride mechanics break down, which is why incline is the better tool.
Why your Apple Watch makes this more confusing
Apple Watch is great at heart rate during a walk, and its heart rate zones will tell you exactly which zone you were in. That part works perfectly for this question: start an Indoor Walk workout, walk for 40 minutes, and look at the zone breakdown afterwards. If most of the session is Zone 1, your pad speed is too low or your fitness is too high for flat walking.
The confusion comes from VO2 max. Apple Watch only estimates cardio fitness from outdoor walks, runs and hikes — indoor workouts, including anything on gym equipment, don't count towards it at all. So if you switch your aerobic base work to a walking pad, your cardio fitness estimate will sit unchanged for weeks. That doesn't mean your fitness is plateauing; it means the algorithm didn't see anything. I've written separately about which workouts do and don't update VO2 max, because this catches a lot of people out.
Two more small things worth knowing:
- Heart rate lags at low intensity. At easy efforts, heart rate takes several minutes to stabilise — often 5 to 8 minutes, longer than it does during hard intervals. So don't judge your zone from the first few minutes of a walking-pad session. Look at the middle and end.
- Zone calculations are based on your heart rate reserve or max heart rate. If your max heart rate in Apple Health is set from the age formula, your zones may be shifted. Worth checking once.
What walking pads are genuinely brilliant for
Let me be fair to them, because the Zone 2 framing undersells the real benefits.
Reducing sedentary time. Long unbroken sitting is associated with worse cardiometabolic outcomes, and breaking it up with short walking bouts is one of the cheapest health interventions available. A walking pad makes this frictionless. This is a real, well-supported benefit — just a different one from zone training.
Volume for beginners. If you're starting from a low base, a walking pad at 4.5–5 km/h is a genuinely effective way to build aerobic fitness, and it's easy to accumulate 45–60 minutes a day. The World Health Organization's guidance is 150–300 minutes of moderate activity per week, and a walking pad is one of the easiest ways to get there. For this group, it absolutely does count as Zone 2 — because walking is their moderate intensity.
Recovery days. Easy movement on a flat pad keeps the habit, gets blood flowing and costs almost nothing in recovery terms. On a day when your Century recovery score is low, a flat 20-minute walk is a sensible choice — much better than a hard session you'll pay for later.
Step volume without weather. No rain, no traffic, no route planning.
What they won't do
Turn flat walking into Zone 2 for a trained athlete. If you have a strong aerobic base, walking is largely below your first threshold and stays there. You need incline, or a different modality.
Build VO2 max. Zone 2 work doesn't build VO2 max directly in the first place — high-intensity work does that. And indoor walks don't even register in Apple's VO2 max estimate.
Replace long, continuous Zone 2 sessions. A 25-minute pad walk with a break for a phone call is not the same stimulus as 60 minutes of uninterrupted easy riding. Continuous duration matters for mitochondrial adaptation.
A protocol that works
If you want an indoor walking-pad Zone 2 session that's actually in Zone 2:
- Warm up for 5 minutes at an easy pace.
- Set speed to hold roughly 100+ steps per minute — usually 4.5–5.5 km/h — and add incline if your pad has it. Start at 4% if you're new to incline walking; 6–8% if you're fit.
- Walk unassisted where possible, or use the desk only for occasional balance.
- Check your heart rate at minute 15 and minute 30. If it's in your Zone 2 range and you can still hold a full conversation, you've got it. If you're below, add incline. If you can only speak in short sentences, back the incline off.
- Aim for 40–60 minutes in the zone, three to four times a week, plus at least two strength sessions — that's the shape the guidelines suggest for a healthy week.
- Compare across sessions, not within one. Same speed, same incline, same duration: is your heart rate drifting up, flat, or drifting down over a few weeks? Falling heart rate at the same output is aerobic adaptation. Rising heart rate at the same output on a day when you slept badly is fatigue. Your watch's heart rate zones and Century's daily recovery score together give you both halves of that picture.
Bottom line
A walking pad can absolutely be Zone 2 training — for some people, at some speeds, with some incline. It is not automatically Zone 2 training because it's a walk and the session says "easy" on it.
The test is boring and reliable: roughly 100 steps per minute, a heart rate inside the lower end of your zone band, and the ability to talk in full sentences for 40 minutes. If your indoor walk passes that test, count it. If it doesn't, add incline before you add more time — and for step volume, sedentary-time reduction and easy recovery days, keep walking either way.
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