A portable apparatus includes a housing, the apparatus includes: a heart activity sensor configured to measure heart activity measurement data related to a user carrying out a physical exercise； a communication circuitry configured to provide the portable apparatus with wireless communication capability； a memory unit configured to store an audio track； and a processing circuitry configured to receive configuration data from an external user interface apparatus over the bidirectional wireless communication connection established through the communication circuitry. The received configuration data includes control data controlling audio playback of the audio track to process and play the audio track according to the received configuration data. The portable apparatus includes a support structure that enables attachment of the portable apparatus to a body of the user.
