I’ve been interested in longevity research for a while now. And one concept keeps coming up in every serious conversation about it: Zone 2 cardio. Peter Attia talks about it constantly. So does Andrew Huberman. The data is hard to argue with.
The frustrating part? Most people either don’t know what it is, or they think it means long boring jogs on a treadmill. It doesn’t.
What Zone 2 actually means
Your heart rate has five training zones, from resting (Zone 1) to all-out effort (Zone 5). Zone 2 is the sweet spot for aerobic development: roughly 60–70% of your maximum heart rate, where you’re working but could still hold a conversation.
At this intensity, your body primarily burns fat for fuel and trains your mitochondria — the energy-producing structures in your cells — to become more efficient. Over months, this translates to lower resting heart rate, better metabolic health, improved VO2 max, and measurably lower risk of cardiovascular disease.
The research on Zone 2 and all-cause mortality is some of the most compelling in exercise science. People with high aerobic capacity consistently live longer and have better quality of life into old age.
How to know if you’re in Zone 2
60–70% of max HR. Rough formula: 220 minus your age = max HR.
You can speak in full sentences — but you wouldn’t want to give a speech.
You can breathe through your nose comfortably. If you can’t, you’re above Zone 2.
Around 5–6 out of 10. Working, but not grinding.
How much do you need?
Most longevity researchers point to 3–4 hours per week as the threshold for meaningful adaptation. That sounds like a lot until you break it down: 45–60 minutes, four times a week. Or 30 minutes every single day.
The key insight that changed how I think about this: Zone 2 doesn’t require a workout. A brisk walk at 4–5 km/h puts most people squarely in Zone 2. That means every step you take while going about your day can count.
The walking pad angle
This is why I find walking pads so interesting from a longevity perspective. If you can accumulate 60 minutes of Zone 2 walking during your workday — answering emails, reading, doing light tasks — you’ve hit your daily target without carving out separate workout time.
What I’d use
The UREVO Strol 2E runs quietly enough for calls and hits the right speed range for Zone 2 walking. Under $300, folds flat. If I were building a home office setup optimised for health, this would be in it.
👉 Check Current Price on AmazonZone 2 vs HIIT — do you need both?
Short answer: ideally, yes. Zone 2 builds your aerobic base — the foundation everything else sits on. HIIT builds peak capacity and metabolic flexibility on top of that base.
The ratio that keeps coming up in the research: 80% Zone 2, 20% higher intensity. Elite endurance athletes have trained this way for decades. The data increasingly supports it for everyday health too.
But if you’re currently doing zero Zone 2 — that’s the first thing to fix. Everything else is secondary.