iPhone · Recommended

Connect Apple Watch on iPhone

Apple Watch records into Apple Health, which is Zone Training Log’s source of truth on iPhone.

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Start with the provider’s official documentation

Vendor documentation is authoritative and may be updated before this guide.

Last verified: 2026-07-22

Vendor screens, wording, and available data types can change. Check the official documentation above if a step looks different.

Apple Watch

Apple Health

Zone Training Log

Pair Apple Watch with this iPhone and record a workout with the Workout app or another Health-compatible app.
Open Zone Training Log and allow workout and heart-rate read access when asked.
Keep Apple Health enabled as the shared store; no Apple Watch account connection is needed in Zone Training Log.

This is the recommended iPhone route. Apple’s Workout app normally provides the workout and detailed heart-rate samples needed for zone analysis.

A workout needs usable heart-rate samples for Zone Training Log to calculate time in zones.
Third-party watch apps can write a different set of fields than Apple’s Workout app.

Open Health → Browse → Activity → Workouts and confirm the workout appears.
Open Health → Browse → Heart → Heart Rate and check that readings exist during the workout.

If the workout is missing, confirm the recording app may write Workouts to Health.
If the workout has no zones, check that Zone Training Log may read Heart Rate and that the workout contains readings.

iPhone

iPhone