Unfortunately, rhythmo.me does not yet support the uploading of data from Garmin smartwatches. If you are still interested in learning about your heart chronotype and participating in RiPL's research, please head to the GarminDB GitHub and follow its instructions.
If your Fitbit watch is linked to your Google account, follow the instructions in this Google Accounts help article. If your Fitbit watch is linked to a Fitbit account, follow the instructions below.
Step 1: Select data to include, select the Fitbit device(s) and click Next step.
Step 2: Choose file type, frequency & destination, select Send download link via email as a ZIP file.
Note: If you have a large amount of Fitbit data it can take up to a few days to generate your account data archive. Check the status of your request in your Data Export account settings.
Unfortunately, rhythmo.me does not yet support the uploading of data from Samsung smartwatches.