Next revision of The BreakAway: Indoor Training iOS App will now support the CORE Body Temp Sensor
The Core Body Temp data will be stored in the FIT file and uploaded together to intervals.icu (or your platform of choice. Depending on the platform, you may or may not need to use the THb field if the Core Temp field is not available)
Partial List of Features Available in the App can be found here
Note: Skin Temp is currently not written to the FIT file but is available as one of the many Data Fields to choose from in the app.