Zone 2 / Field Guide

Home / Apple Watch Check Kit

A WORKSHEET YOU CAN USE BESIDE YOUR WATCH

Your watch.
Your next check.

Choose a problem, inspect the device, keep the result.
The sheet updates as you go. Unknown is a useful answer.

A brass compass, clear ruler and a stone examined through a magnifying glass.
AI-generated conceptual illustration

Start with the problem

What brought you here?

On your watch: Settings → General → About → Version. If it differs, choose “Another version” instead of guessing.

Keep readings and personal details on your own device. References open in a new tab. Choices stay here; reload starts a blank sheet.

My zones disagree

Compare the method behind each label.

For Apple Watch versus a calculator or another zone guide. Keep the original limits while you check.

01

Separate the two problems

  1. The two screens
  2. What are you comparing?

Different zone boundaries and a heart-rate reading you distrust are separate questions. This worksheet compares definitions and settings; it cannot verify a live measurement.

Official reference
02

Inspect the existing zone setting

  1. Apple Watch Settings
  2. Workout
  3. Heart Rate Zones

Note Automatic or Manual without editing limits. On iPhone: Watch app → My Watch → Workout → Heart Rate Zones.

Official reference
03

Find the other tool’s method

  1. Calculator or guide
  2. Method / help

Find its stated inputs and calculation method. Record the category here; keep all numbers on the original device or page.

Official reference
04

Compare the definitions

  1. Watch documentation
  2. Other tool’s definition

Check what each source means by its zone labels. A shared name alone is not a shared definition.

Official reference
See my check sheet

I cannot see my zones

Find the view. Keep a record of the gap.

For the Heart Rate Zones view in Apple’s Workout app. This does not cover third-party workout apps.

01

Check the calculation prerequisite

  1. Your iPhone
  2. Health app

Apple requires a date of birth in Health to calculate zones. Inspect this privately on your iPhone. Do not enter or copy it here.

Official reference
02

Check the selected workout’s views

  1. Workout app
  2. Choose workout
  3. Views
  4. Include

For watchOS 26, choose the workout, open Views and look for Heart Rate Zones. Enable Include if offered. Available views depend on the workout type.

Official reference
03

Find it during a planned workout

  1. Your planned cardio workout
  2. Digital Crown
  3. Heart Rate Zones

During a cardio workout you already intended to do, turn the Digital Crown to the zone view. Leave this check for later if you are not exercising.

Official reference
04

Find the saved zone breakdown

  1. iPhone Fitness
  2. Sessions
  3. Workout
  4. Heart Rate · Show More

For a completed workout, open its heart-rate details in Fitness. Keep any readings on your device.

Official reference
See my check sheet

What this kit can settle

A practical record

Which setting you found, which source is missing, and what to check next. Keep it beside your device or bring it to a support conversation.

A limit to respect

It cannot verify sensor accuracy, choose a personal zone range or assess symptoms. No watch is connected. Every recorded result is your own observation.

Apple documentation: watchOS 26. Checked 2026-09-14; hands-on verification pending. Independent project, not affiliated with or endorsed by Apple.

Understand why zone methods differ