Polar has launched the Polar Loop, a minimalist fitness band without a display or a subscription fee. The device tracks heart rate, activity, sleep, and recovery and syncs data to the Polar Flow app.

Fitness tracking app Polar Flow allowed anyone with relatively little effort to work out the names, home addresses and daily movement routes of thousands of military and intelligence officials who ...

We may earn a commission from links on this page. Polar's new strap has an eight-day battery and costs $199.99. The strap doesn't have its own GPS or any kind of screen, but does feature an optical ...