Exercising in an urban setting is not only a way to keep fit or to train to improve performance, but it also stimulates the imagination, transforming the city into a huge playground. Mens Sana In Corpore Sano is based both on a physical and intellectual understanding of sport in the city. By adding pieces of sports equipment to sign posts, the project establishes not a discrete traditional fitness trail but enables each journey to be transformed into a fitness trail. This series of interventions aim to transform the use and perception of the city. From the most common (basketball, football) to the surprising (boxing, golf) the choice of the activities is significant. Their presence suggests an unexpected use of space, inviting people to reconsider their relationship with the built environment. The interventions are fully functional equipment and also art installations, addressing both the body and the mind. Mens Sana In Corpore Sano is urban furniture that seeks to convene curiosity, to be fun and to instigate critical distance that exalts the body's engagement with the urban realm. This project has been done in partnership with Nicolas Lelièvre for Forme Publique Biennale du mobilier urbain.