Passage 6.23.4
ἔστι δὲ καὶ ἄλλος ἐλάσσων γυμνασίου περίβολος, ὃς ἔχεται μὲν τοῦ μείζονος, τετράγωνον δὲ ὀνομάζουσιν ἐπὶ τῷ σχήματι· καὶ παλαῖστραι τοῖς ἀθλοῦσιν ἐνταῦθα ποιοῦνται, καὶ συμβάλλουσιν αὐτόθι τοὺς ἀθλητὰς οὐ παλαίσοντας ἔτι, ἐπὶ δὲ ἱμάντων τῶν μαλακωτέρων ταῖς πληγαῖς. ἀνάκειται δὲ καὶ τῶν ἀγαλμάτων τὸ ἕτερον, ἃ ἐπὶ ζημίᾳ Σωσάνδρου τε τοῦ Σμυρναίου καὶ Ἠλείου Πολύκτορος τῷ Διὶ ἐποιήθη.
There is also another enclosure of the gymnasium, smaller in size, adjoining the larger one; and because of its shape, they call it the Square. Here they arrange wrestling schools for competitors, and here they also match athletes who are no longer wrestling, but competing with softer leather thongs for striking blows. In this place stands also one of the statues which were set up in honor of Zeus, as a penalty upon Sosandros of Smyrna and Polyktores of Elis.