is it possible to edit, i.e. modify and save a .fit?

[chauvinSimon]

So far I can "decode" .fit files and export them e.g. in .json.

Then I can easily modify the .json.

I would like now to save the modified .json back to some .fit. But I could not find how.

Maybe this tool is only for "decoding" (therefore the name :smiley: ), not editing.

[HaleTom]

For re-writing a .fit, try https://developer.garmin.com/fit/fitcsvtool/