For that optical sensor, there are some ways to improve the accuracy of readings.

Just the Sense currently offers an additional ECG sensor to offer medical-grade readings of your heart. Most of Fitbit's devices include an optical-based heart rate monitor.

Make sure you do this to ensure the best accuracy in the pool. On the Sense and Versa series smartwatches, you can do this before each swim on the watch itself by tapping the cog icon in the top left and adjusting the distance. Then tap through to the swimming option to adjust the pool length. You can do this by going into your Account > Activity & Wellness and going to Exercise. If you want to track a swim session, make sure you've calibrated the tracker to the length of the pool. However, if you find auto-tracking isn't working quite right, even once you've adjusted the time, you can turn it off for each exercise individually. The shortest amount of time you can set this for is 10 minutes, but, don't worry, any exercise you do in those first few minutes will still be accounted for. Through Fitbit SmartTrack, workouts are automatically detected, including walking, running, cycling, and even swimming.īy going into 'Account', 'Activity & Wellness, and then into 'Exercise', you can tweak how long Fitbit will wait to kick in tracking when it automatically detects an exercise is happening. For Android users, you'll need to log into the web dashboard, go to the settings tab, and scroll down to the page to find the ability to toggle sleep sensitivity between normal and sensitive options.

By default, this will be set to 'Normal', but you can tweak it to 'Sensitive' if you find that the tracker isn't registering your sleep, or is registering odd results.ģ. In the Fitbit app, go to Account > Activity & Wellness > Sleep.Ģ. Adjusting sensitivity differs depending on whether you're paired with an iPhone or Android phone. You can calibrate your Fitbit for sleep, even if you don't have the advanced Sleep Stages and Sleep Insights features.

Fitbit heart rate