I use basecamp to manipulate the gpx file, you can also do this manually in a text editor such as notepad. http://www.gpsvisualizer.com/ will convert the fit file on your device to a gpx file for editing.
@freezing77 started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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I use basecamp to manipulate the gpx file, you can also do this manually in a text editor such as notepad.
http://www.gpsvisualizer.com/ will convert the fit file on your device to a gpx file for editing.