There is provided an exercise monitoring device, comprising: a display configured to display exercise data with respect to a plurality of exercisers during a group exercise session. The exercise monitoring device is caused to: receive a signal wirelessly from each of a plurality of exercise sensors, wherein each exercise sensor measures the exercise data with respect to an exerciser carrying the respective exercise sensor; perform sorting of the plurality of exercise sensors at least partly on the basis of the received signals during the group exercise session; and display the exercise data on the display on the basis of the sorting during the group exercise session.