Beagle is a design concept aiming to improve the quality of life and the development of hospitalized adolescents (12-16) with Cystic Fibrosis (CF). During hospitalization CF patients are isolated to prevent cross infection of bacteria. They suffer from boredom, a decrease in social contact and a negatively affected physical activity level. Beagle is a concept that facilitates various forms of playful interaction for adolescents throughout the hospital, motivating them to become physically active within the boundaries of the hospital's installed segregation policy. A first explorative and qualitative study was conducted to see how adolescents experience and use Beagle.@en