Zone 2 Cardio: What It Is and How Much You Need
Zone 2 cardio is steady exercise at a pace where you can still hold a conversation, often described as roughly 60 to 70% of your max heart rate. For most adults, about 150 minutes a week of moderate activity meets the guidelines, and zone 2 walking, cycling or rowing is an easy way to get there. It's good for your heart and easy to recover from, but it won't build muscle, so pair it with two or three strength sessions.
What zone 2 means
Training zones split effort into bands, usually five. Zone 2 is the second: steady work you could keep up for an hour. A 2025 panel of sport scientists and coaches placed it just below your first lactate or ventilatory threshold, where your breathing starts to pick up. That takes a lab to measure, so use two shortcuts:
- The talk test. The CDC's rule for moderate effort is that you can talk but not sing. Zone 2 lives there: full sentences, a little breathless, no singing.
- Heart rate. Roughly 60 to 70% of your max heart rate is the usual guide.
The catch: 220 minus your age is only a population average. A meta-analysis of 351 studies and 18,712 people found 208 minus 0.7 x age fit better, and that 220 minus age underestimates max heart rate in older adults. Your own number can be well off either way. If the heart rate on your wrist and the talk test disagree, trust the talk test.
Why zone 2 got so popular
Podcasts and wearables did most of the work. Wearable tech is the number 1 trend in the American College of Sports Medicine's 2026 fitness trends survey, and most watches now color-code your heart rate into zones. The pitch: easy cardio that builds more mitochondria (the parts of your cells that use oxygen to make energy) and teaches your body to burn fat.
What the research does and doesn't show
Steady, moderate cardio is good for you, and it counts toward every major activity guideline. What the research doesn't support is the idea that zone 2 is a magic intensity. A 2025 review in Sports Medicine found no good evidence that zone 2 is the best intensity for improving mitochondrial or fat-burning capacity, and concluded that harder efforts matter, especially when your training time is limited.
So treat zone 2 as a base, not the whole plan. It's easy to recover from, which is exactly what you want when you're coming back. Once you're fitter, a few hills each week add the harder work.
How much you need
The World Health Organization recommends at least 150 minutes a week of moderate activity (up to 300 for extra benefit) or at least 75 minutes of vigorous activity, plus muscle-strengthening work on 2 or more days.
| Weekly target | What it can look like |
|---|---|
| 150 minutes | 30 minutes, 5 days a week |
| 300 minutes | 45 minutes most days, for extra benefit |
Zone 2 walking, cycling or rowing
| Activity | How to stay in zone 2 |
|---|---|
| Brisk walking | Walk fast enough to breathe harder but still talk. If flat ground is too easy, find a hill |
| Cycling, outdoors or stationary | Pick an easy gear and keep your legs turning steadily. Shift down on hills instead of grinding |
| Rowing machine | Smooth, relaxed strokes, legs first. If you can't talk, slow the stroke rate |
Out of shape, a flat walk may already be zone 2. Fit, you may need a hill. Pick the one you'll actually do.
Why it isn't a replacement for strength training
Zone 2 looks after your heart and lungs. It does very little for muscle and strength, which we lose from our 40s onward if we don't train them. The ACSM report notes that fewer than 30% of US adults meet the muscle-strengthening guideline. As with walking for fitness, cardio is the daily habit and lifting is the part that keeps you strong.
Do zone 2 between lifting days, or after a strength session, so tired legs don't cost you good sets. The science of training after 40 explains why both matter.
How to start if you're coming back
- Week 1: 3 sessions of 15 to 20 minutes at talk-test pace. Walking is fine.
- Week 2: 4 sessions of 20 to 25 minutes.
- Week 3: 4 sessions of 30 minutes, about 120 minutes for the week.
- Week 4: 5 sessions of 30 minutes. That's 150 minutes, the guideline.
Add two or three strength sessions from week 1, even short ones. If a cardio day feels hard, slow down rather than skip it. Easy is the point.
A week of zone 2 cardio plus strength
Here's a week that fits zone 2 around three strength days, using Liftspan's free Full Body, 3 days plan.
| Day | Session | How long |
|---|---|---|
| Monday | Full Body A | About 45 minutes |
| Tuesday | Zone 2 walk or ride | 30 to 45 minutes |
| Wednesday | Full Body B | About 45 minutes |
| Thursday | Zone 2 row or ride | 30 to 45 minutes |
| Friday | Full Body C | About 45 minutes |
| Saturday | Long zone 2 walk | 45 to 60 minutes |
| Sunday | Rest, or an easy stroll | As you like |
Full Body A, B and C each cover a squat, a hinge, a push, a pull and a carry or core move, in about 45 minutes.
Add the strength days, free
Keep your zone 2 days: logging a walk, ride or row keeps your daily flame going. Full Body, 3 days is free in Liftspan: it's built for your equipment and around any joint you flag, every weight is set for you and moved up as you earn it, and each block ends with a lighter deload week. Rather use paper? Download the sheet.
Common questions
What is zone 2 cardio?
Steady exercise at an easy to moderate effort, where you can talk in full sentences but couldn't sing. It's often given as roughly 60 to 70% of your max heart rate, just below the point where your breathing picks up noticeably.
How do I find my zone 2 heart rate?
Age formulas give a rough estimate of max heart rate, and 60 to 70% of that is a starting point. Because formulas can be well off for any one person, check it against the talk test. If you can't hold a conversation, you're above zone 2.
How many minutes of zone 2 a week do I need?
The WHO and CDC guidelines start at 150 minutes a week of moderate activity, and zone 2 counts. That's 30 minutes on 5 days, or longer sessions on fewer days.
Is zone 2 better than harder cardio?
Not according to a 2025 review, which found no good evidence that zone 2 is the best intensity for fitness or fat burning. It's a great base because it's easy to recover from. Harder efforts add more once you're fit enough.
Using Liftspan? See how logging a walk keeps your daily flame going in the help manual. New to it? Liftspan is a strength training app for lifters over 40 that builds your plan around your joints and moves the weight for you.
Sources: CDC, Measuring physical activity intensity · WHO physical activity recommendations · Tanaka et al. 2001, Age-predicted maximal heart rate revisited · What is "Zone 2 Training"? Experts' viewpoint (IJSPP, 2025) · Storoschuk et al. 2025, Much ado about zone 2 (Sports Medicine) · ACSM top fitness trends for 2026. General information, not a substitute for a clinician.
Keep reading: does walking build muscle? · the science of training after 40 · heart rate variability for training · how to start working out again after a long break · all guides