Example embodiments relate to systems, methods, apparatuses, and computer readable media relating to a user interface, that may for example, initiate transmission of a stream of audio data comprising a plurality of audio tracks from a music streaming service, and receive athletic activity data relating to a performance of an athletic activity by a user during an activity time period that includes a plurality of time intervals. For each of the plurality of time intervals, an athletic activity level is determined from the athletic activity data, a target audio track intensity corresponding to the athletic activity level is determined, and a playback of a streamed audio track corresponding to the target audio track intensity is initiated.