This content is provided by an external author without editing by Finextra. It expresses the views and opinions of the author. Simple to adapt and made of soft, durable silicone, these payment ...

Polar is renowned for the accuracy and reliability of its heart-rate monitors, a reputation earned in large part by the H9.

I was a bit confused when Polar announced the Grit X2 earlier this year – surely, this watch has already been out for a while? Then I realised I was thinking about the Garmin Fenix-rival Polar Grit X2 ...