Apple Watch, Garmin and Polar: a Day with FitMesh

A practical scenario: sleep, training, and routine in different ecosystems

A frequent configuration among endurance athletes and fitness enthusiasts pairs an Apple Watch for sleep tracking, connectivity, and daily routine, alongside a dedicated Garmin or Polar device selected for battery endurance, mapped GPS navigation, and physical buttons during intense sessions. In addition, many carry a corporate Android smartphone (such as a Samsung Galaxy) where checking recovery and daily totals is desirable during working hours.

Without an integration layer, this setup fragments your data: morning steps remain locked in Apple Health, trail running distance sits in Garmin Connect or Polar Flow, and the work phone displays nothing. FitMesh is a mobile application (available for iPhone on the App Store and Android on Google Play) that solves this problem by linking your devices to a single personal account. The concrete benefit is not simply viewing charts: it reconstructs your full day without manually piecing together fragmented records across multiple apps. With the same account you see the same already synced data on your other phone too.

Morning: sleep and wake-up with Apple Watch and iPhone

The day begins with overnight biometric tracking. Apple Watch records sleep stages, resting heart rate, and heart rate variability (reported as SDNN by Apple HealthKit). Upon waking, these values populate the local HealthKit database on your iPhone.

When you open FitMesh on the iPhone, the app reads from Apple Health the data you allowed it to read. Sleep samples and the first steps of the morning are used to build the day's overview. In this version FitMesh does not write sleep to Apple Health. One of the reasons: a sleep stage with a label it does not recognise would be written as light sleep, which is sleep nobody measured.

Training: endurance session with Garmin or Polar

For a long run, trail outing, or cycling session, the athlete switches to a dedicated sports watch. With Garmin, the watch tracks GPS coordinates, elevation, cadence, and heart rate. Back home, the activity syncs to the Garmin Connect companion app via Bluetooth or Wi-Fi.

For this workout to reach your broader ecosystem, sharing must be active in Garmin Connect settings: directed to Apple Health on iOS (as documented in the official Garmin guide for Apple Health), or to Health Connect on Android (as described in the official Garmin guide for Health Connect). For step-by-step instructions on Samsung phones, refer to our guide on syncing Garmin with Samsung Health.

If using Polar instead, the hardware type makes a difference. With a GPS watch (such as Vantage or Grit X), workouts and steps pass from Polar Flow to Apple Health (as detailed in official Polar support for Apple Health) or Health Connect (explained in our guide on Polar synchronization with Health Connect and official Polar Flow Health Connect documentation). Polar documentation notes that the Apple Health connection exports heart rate collected during recorded training sessions, but does not provide continuous 24/7 background heart rate. By contrast, a Polar H10 chest strap has no daily step sensor or autonomous sleep tracking: it measures electrical heart rate during an active session and streams it to Polar Flow or a paired watch.

Work: corporate Samsung Galaxy as a second window

During working hours, your personal iPhone may remain in a bag while a corporate Android phone (such as a Samsung Galaxy) sits on your desk. If you install FitMesh on the Android device and sign in with the same account, you see the data already synced from the iPhone.

This holds even if the Android phone recorded no data that morning and is not paired over Bluetooth with the Apple Watch or the Garmin. The app shows the day's steps, the previous night's sleep and the morning workout, once they have been synced from the iPhone. If company policy allows it, you can also turn on writing to Health Connect in FitMesh: it is optional, it is switched on with a toggle in the app, and it needs Health Connect permissions. Other authorised apps on that phone can then read the steps FitMesh wrote.

Evening: daily reconciliation and metric fusion

By evening, the app shows the day's steps, the workout recorded with Garmin or Polar and the night's sleep. If more than one device counted steps on the same day, the total is not their sum: the box below explains how FitMesh chooses. For more on overlaps and priorities across several watches, see our guide to duplicate data in Health Connect.

Necessary boundaries: what remains in vendor applications

FitMesh aims to restore your holistic biometric picture, not to duplicate vendor-specific features. Certain proprietary metrics rely on closed algorithms and are not exported into open health frameworks:

• •Garmin: metrics such as Body Battery, Training Readiness, and daily suggestions stay inside Garmin Connect (for technical export limits, see our analysis of Garmin Body Battery and Health Connect).
• •Polar: Nightly Recharge scores, recovery indicators, and Running Index evaluations stay within the Polar Flow app.
• •Apple: Activity Ring closures and motivational awards remain tied to the native Fitness app on iOS and watchOS.

Configuration checklist: steps to get started

1. Single account: sign in to FitMesh with the same account on both your iPhone and your corporate Android device.
2. iPhone permissions: grant FitMesh read access to Apple Health for steps, workouts, heart rate, and sleep (in Settings → Health → Data Access & Devices → FitMesh).
3. Vendor forwarding: open Garmin Connect or Polar Flow and enable syncing to Apple Health (on iOS) or Health Connect (on Android).
4. Android permissions: on the secondary phone, grant FitMesh read access (and optional write-back if desired) in Health Connect settings.
5. Verification sync: open your companion app to upload wearable data, then launch FitMesh to verify the aggregated timeline.

Quick troubleshooting: if a metric is missing on the second phone

If after a workout you observe that metrics appear on your iPhone but have not yet synced to your corporate Android phone, the first step is to check the multi-step transfer sequence across devices:

• •Check the vendor upload: ensure the sports watch has fully synced with Garmin Connect or Polar Flow via Bluetooth or Wi-Fi.
• •Inspect the local framework: confirm that the workout is visible inside Apple Health or Health Connect on the primary phone.
• •Open FitMesh on the primary phone: its data appears on the second phone only after it has been synced.
• •Verify network access on the secondary phone: ensure corporate firewalls or VPN restrictions do not block traffic, then open FitMesh to refresh.