In this thesis project has been realised a concept for a rehabilitative chair for bariatric patient, which purpose is to motivate and introduce movement in the first stage of their rehabilitation path. The request of this project came from the Medical Science Department of “Università di Torino”. The final purpose of this innovative system is to recover mobility and muscle tone and as a consequence the patient should be more aware, motivated and self-confident especially with work out. The product concept came out from a multidisciplinary research such that different areas of engineering and design were involved. The study started from an analysis of obese people in the world, than the focus moved to this health issue in Italy.