Exercise consists a vital aspect of every life nowdays. Multiple facilities and pieces of equipment, have appeared, and the types of programs and activities have increased, so as to satisfy a wide variety of demands. The necessity of such spaces in the city, that offer the possibility of exercising either as a group or personal, has become apparent. However even though the way of training has been enriched with various programs, the spaces which facilitate them remain the same. The equipment evolves without actually changing the enviroment  in which is located. This particular aspect of working out has inspired the beginning of this thesis project. Re_act, proposes a series of buildings and public segments that aren’t necessarily related to the idea of the gym typology. It utilizes its elements as a base to construct a number of urban environments and unpredictable situations inside the park. In the first stages of conception, it was considered crucial to identify the  range of activities and programs that already exist in the study area. This research was depicted through multiple diagrams which analyze the nature of such facilities and the social group  to which they refer. This process defined the final programmatic diversity, as well as, the location of the proposal.