Science-backed guides to help you train smarter, live longer, and actually hit your Zone 2 targets.
Zone 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.