This article provides an approach to the complex universe of the logics leading the colonization of urban public spaces through informal physical activities. In more or less intensity, these activities use and take a greater part of the streets and squares from the city of Barcelona. The reflections to follow, will observe the heterogeneity of the phenomenon which, far from representing exclusively ideas of the overcoming the modern sporting system in order to locate itself in a postmodern universe, presents itself as a total social fact: a "urban" sport which is simultaneously modern and postmodern, formal and informal, recreational and competitive, free and directed, open and closed, contradictory and complex, always. Among this context, some urban sports agendas can be drawn or sketched thanks to this study. Our empirical research is based on a set of several studies developed by the Research and Innovation Group about Sport and Society (GRIES) from the Ramon Llull University (Barcelona), that also includes a field work carried out during the period 2002-2006.
