For Fitbit activity segments, oftentimes a "sourceData.logType" property will be available. There are several values associated with this property. See the following for details from Fitbit's documentation:
auto_detectedactivity logs are those created by Fitbit’s SmartTrack feature.
fitstaractivity logs are created after completing a FitStar workout.
manualactivity logs are user specified overrides of some or all tracker data.
mobile_runactivity logs are created after completing a MobileRun.
trackeractivity logs are those created using the multisport exercise mode on a Fitbit device.
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