How do I synchronize Polar Flow with my Apple Watch serie 6?

Hi there, mvitaln,

Thanks for visiting the Apple Support Communities. We understand you are using a third party device and/or service to track your running, and would like to know if it's possible to sync with your Apple Watch. We are happy to provide you with some information.

According to the Polar Flow website, you can sync your Polar Flow using their Flow App. This can be downloaded onto your iPhone from the App Store: Polar Flow app and compatible devices | Polar Global.

For further questions on usage and syncing, including whether they offer an option to sync directly with your Apple Watch, please get in touch with Polar directly: Contact Us | Polar Global.

Have a wonderful day.