Add Yahoo as a preferred source to see more of our stories on Google. The Fitbit app is free to use, but Fitbit Premium adds additional features to the tracker. You can pay for Fitbit Premium on a ...

Users who miss the deadline could permanently lose access to key historic data on metrics such as their heart rate, workouts, calorie burn, and sleep time.

When you buy through our links, Business Insider may earn an affiliate commission. Learn more From counting steps and tracking workouts to monitoring sleep patterns and stress levels, Fitbits can help ...