Paredes, HugoCassola, FernandoMorgado, LeonelCarvalho, Fausto deAla, SilviaCardoso, FranciscoFonseca, BenjamimMartins, Paulo2014-11-042014-11-042014978-3-319-08595-1http://hdl.handle.net/10400.2/3474The combination of the potentialities of the interactive technologies, like exergames and the emerging motion capture devices with the ability of 3D virtual worlds for socialisation and context, can produce a platform to promote the physical activity of its users, which leverages its potential. The OnlineGym is an exploratory project based on an online 3D virtual worlds platform that allows users to interact with the system through the use of a motion capture device. This paper discusses the chosen technological approaches and the preliminary results of the experiments performed with users.engActive ageingVirtual worldsPhysical activityOnlineGymbook part2014-07-1010.1007/978-3-319-08596-8_47