There are some good OSS libraries to read and interpret those files (e.g. Python https://github.com/polyvertex/fitdecode, Go https://github.com/tormoder/fit).
To get your _current_ data, it is possible to pull the current .FIT files from your device (watch, bike computer, ..) when it is plugged to your computer and mounted as file system.
I once started a side project to do exactly that, but abandoned it after a while (https://github.com/jo-m/garmin-disconnect).
the lesson i learned is you can't just expect these exports from any online services to be complete or what you expect. i highly recommend going through an export of anything you depend on and see if it has what you expect.
I now understand that's not the case, but still don't quite know what it is. I think a supersonic aircraft is constantly "dragging" a boom behind it. So when it passes overhead sometime later you'll hear a boom. Is that right? Does that mean you'll see a plane flying overhead, hear the normal drone associated with it, but at one particular moment here a distinctly louder but shorter noise?
And is this a real thing that can be done? How do you make the sonic boom go away? As someone who lives where planes are flying overhead constantly, can it be used to make non-supersonic planes quieter, too?