Watch says you’re in the red but body feels fine? You’re not imagining it. Discover why 220 minus age fails women and how to ...

A person’s heart rate variability refers to the way in which their heart changes its rhythm with each beat. A higher number indicates resilience and longevity, while a lower number shows the body ...

You can also test the accuracy of your numbers out on the run, for example by running at what feels like a hard pace (using the ‘talk test’, you should only be able to get two or three words out at a ...

Polar's companion apps offer heart rate training options as well as a simple VO2 Max test so you can track your fitness progress over time. The H9 doesn't have any onboard memory, though, so it can't ...

Live your life healthier and happier with our free weekly Living Well newsletter A person’s heart rate can say a lot about their fitness levels. With the average smartwatch or fitness tracker, people ...