You clearly buy a Fitbit smartwatch for its fitness tracking, and the company wants to be sure you wring the most out of that tentpole feature. It just released a Fitbit OS 3.0 update for the Ionic and Versa that provides both more fitness info and enables more powerful exercise apps. You'll see more health info at a glance, such as a more detailed exercise view (including hourly activity and heart rate) and sleep data. You can quickly log your water intake and weight, too. Fitbit is also introducing menstrual cycle trends in early 2019 to help women track their reproductive cycles more effectively.