We believe that designers play a crucial role in combating the most rapidly growing public health epidemics of our time: obesity and its related chronic diseases. In this winterschool we developed new ideas for the city of Amsterdam to enable people to be physically more active in their daily lives. Ideas that will improve activity rates at work, at school, at home and in between. Nineteen teams of students made design proposals. Designs on architecture, urban planning, public space, infrastructure, transportation, interior design, food, social media and other. The teams were interdisciplinary (Architecture, Urbanism, Landscape Architecture) and consisted of first -, second - and third year students. The results are presented in this book.