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From the Blog

Learn Zone 2 the Right Way

Apple Watch Ultra 4 and Zone 2: What the New Sensors Fix, and What They Don't

The best sensor Apple has shipped still feeds a zone built from your birthday.

Read → Beginner Guide What Is Zone 2 Training? The Complete Guide for Beginners Over 40 What it is, why it works, and how to start without overcomplicating it. Read → Apple Watch Why Your Apple Watch Zone 2 Is Wrong (And How to Fix It) A 50-year-old formula sets your zones. Here's why that matters and what to do. Read → Peter Attia Protocol Peter Attia Zone 2: How to Actually Implement His Protocol His recommendations are more specific than most people realize. Here's what they require. Read →

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