Trabajo Regular presentado en CoSECiVi'14. Resumen: In this paper a low-cost step-aerobics instructor simulation system is presented. The proposed system analyses a given song to identify its rhythmic pattern. Subsequently, this rhythmic pattern is used in order to issue a set of steps-aerobics commands to the user, thus simulating a training session. The system uses a Wii Balance Board to track exercises performed by users and runs on an Android smartphone. A set of tests were conducted to assess user experience and opinion on the system developed.