A bit of luck and some strava stalking will find them for you. Wait until Thursday night after they have uploaded their runs, find a segment they would have run on, click on the top results of today and then keep clicking until you find one of them from the group the chances are one of them will call their run 'xxx athletics club run'.
(The easiest way would be to obviously ask one of them in person but presumeably that's not an option!)
A bit of luck and some strava stalking will find them for you. Wait until Thursday night after they have uploaded their runs, find a segment they would have run on, click on the top results of today and then keep clicking until you find one of them from the group the chances are one of them will call their run 'xxx athletics club run'.
That's provided the OP has summit. Alternatively, they could run close to them so that the run is matched on Strava flybys and find them that way...