Urban open spaces are in short supply. And this applies particularly to public spaces in towns and cities that can be used for play, the practice of sport and informal exercise. Open spaces tend not to remain open for long, and often aren’t even planned. At the same time, there seems to a renaissance in public spaces as places for private leisure activities that allow greater scope for the changing needs of people for self-determined activities. So that the right decisions can be taken for future sports- and exercise-related open-space planning, a number of open-space planning principles have to be taken into account – first and foremost, people’s exercise needs and the forms of exercise that are actually practised.