Is it possible to avoid standard FitField from ActivityRecording?

Hello,

Is it possible to avoid standard FitField like altitude from ActivityRecording? For example when i have an indoor activity, what is more or less: ActivityRecording.SPORT_GENERICBut in the FitFile in Garmin Connect i see "Altitude" what is complete unnecessary for my type of Sport.

Is there a possibility to change this?

Thanks