Here’s how it works. We've been testing the best Fitbits for over a decade. In that time, they've gone from minimalist sleep and step trackers through to fully-fledged smartwatches. Then Google ...

Women who have signed up to Fitbit's period tracker have complained that it only allows them to log periods of 10 days or fewer. Many women pointed out that they can last much longer, making the ...

Study participants who averaged between 2.5 and 5 hours of physical activity a week—which is the minimum amount recommended ...