In front of the baths is the gymnasium, a large rectangular courtyard with curved shorter sides, surrounded on all four sides by a portico with Corinthian cipolin columns. On the north side are two rectangular apsidal exedras, with a peristyle, while the south side of the portico faces the entrance to the baths, in front of which are fragments of the dedicatory inscription of the baths, in which the names of the emperor Hadrian, the proconsul Valerius Priscus and his legate Popilius Celer appear.