One of the most important metrics on a Fitbit tracker is the Estimated Oxygen Variation—and now that every tracker is fitted with an SpO2 sensor, everyone can take advantage. Blood oxygen may be used ...

I compared Fitbit Air and Whoop MG sleep tracking over seven nights to see how closely the two agreed.

That’s where pulse oximeters come in. These small devices measure your heart rate and SpO₂. They give you another way to understand how your body responds during exercise and recovery. Also, they may ...

With just a couple of hours to go, we’re still checking price histories and finding genuine discounts on products we’ve tried and tested Simon is Telegraph Recommended's reviews editor, leading our ...

Fitbit's many achievements in its field has, to some extent, turned the brand name into something of a household term for wrist-worn fitness trackers. However, the concept of the fitness tracker ...

The Samsung Galaxy Watch 6 offers a design which is nearly identical to the previous model. You do get a bigger display on the 44mm model and since the case size has not increased a thinner bezel as ...