It shows us when we re in the zone, if you ll excuse such a hateful phrase.
It may sound like only something pro athletes will use, but it s equally helpful for regular people too.
The Polar Beat app is now more beginner-friendly, with an updated menu system, more features, and crucially, a series of tests and challenges to make sure you re getting the most from the app, heart rate monitor, and your exercise program.
Additionally, a real-time data feed shows if your heart is working hard enough to burn fat, or increase overall fitness.
The app now covers 100 different sports, making it far more comprehensive that a normal fitness tracking wrist band, and wearing a heart rate monitor on your chest gives more accurate readings than one on your wrist.
The app is free to download for iOS and Android, and connects to Polar s Flow platform, where exercise data is stored, collated, and analysed.