Speak to your friendly (yes, really!) local DIY organiser - better to agree in advance what he'll expect to see from you ...
Speaking (naturally) from a position of complete ignorance, my naive assumption would be that the app generates a track which is then uploaded to Strava at the end (rather than, say, relying on a constant data link to send a stream of position updates so the track can be generated on the site). If it's possible to extract this raw track - maybe it's as simple as it being saved to something like an Apps/Strava/GPX folder on your device - I'd guess that's the best format to submit, as unprocessed as possible.