Science-backed guides to help you train smarter, live longer, and actually hit your Zone 2 targets.
Garmin starts your Zone 2 at 220 minus your age, then sport zones and auto detection can move it. Four failure modes, five settings to fix them.
AppsAn honest roundup of Zone 2 apps: how each one sets your Zone 2, what it costs, and who it suits.
AppsAthlytic scores recovery. Zone2AI tells you whether each workout was real Zone 2, on Apple Watch, Garmin and Android. An honest side by side.
Walking12-3-30 can be Zone 2, or below it, or above it. What the studies measured, why the answer depends on your heart, and how to dial it in.
Apple WatchThe best heart-rate sensor Apple has shipped still feeds a zone built from your birthday. What changed on September 9, what didn't, and the watchOS 27 door that lets a real Zone 2 into Apple Fitness.
Fitness AgeApple's Health Age is coming late 2026. Zone2AI's Fitness Age is live now. One tells you where you stand; the other comes with the plan that moves it.
RunningZone 2 running feels embarrassingly slow. You might need to walk. That's not a bug — it's the whole method. Here's why slowing down is the fastest way to get faster.
CyclingYour FTP-based power zones and your metabolic Zone 2 are probably different numbers. Here's why cyclists get this wrong more than anyone — and how to fix it.
Training Guide30 minutes? 60 minutes? 90? The research is clear on minimum effective dose — and most people are either overdoing it or cutting sessions too short.
Training GuideNot all exercises are created equal for Zone 2. Cycling, rowing, walking — ranked by how easy they make it to stay in the zone.
Fat LossZone 2 burns fat directly — but the scale hides it. Here's what's actually happening to your body composition, and how to track what matters.
Training ZonesMost people doing "Zone 2" are actually in Zone 3. It feels productive — but it's the least effective training zone. Here's how to tell the difference.
Zone 2 Science220-minus-age, Karvonen, MAF — a breakdown of all 4 methods, why each one fails, and what actually works.
Beginner GuideEverything you need to know about Zone 2 cardio — what it is, why it works, and how to get started without overcomplicating it.
Apple WatchThe Apple Watch uses a 50-year-old formula to set your heart rate zones. Here's why that matters and what to do about it.
Peter Attia ProtocolAttia's Zone 2 recommendations are specific. Most apps can't support them. Here's what his protocol actually requires and how to do it.