http://strava-tools.raceshape.com/vpu/ should get you a .crs file from an activity and you might be able to convert that to a gpx (or tcx) file.
Thanks, seems to strip the power data from the file though.
Never mind.
The data is there in the javascript when you look at someone's strava activity so someone must have created something to do it...
@ewanmac started
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http://strava-tools.raceshape.com/vpu/ should get you a .crs file from an activity and you might be able to convert that to a gpx (or tcx) file.