Physiology-based selection of performance enhancing music for a specific individual is disclosed. Internal effort data and external work data both measured from a user performing an exercise while listening to a specific music track are obtained. The internal effort data describes a measured bodily input of the user, and the external work data describes a measured output effect of the user. A comparison between the internal effort data and the external work data is performed. At least one performance enhancing music track for the user is selected based on the comparison.