ἐπίδειξιν ποιεῖσθαι
From LSJ
ἔστιν δέ που ἡ μὲν ἐπὶ σώμασι γυμναστική, ἡ δ' ἐπὶ ψυχῇ μουσική → I think I am right in saying that we have physical exercise for the body and the arts for the soul
Greek > English (Woodhouse)
make a military demonstration, make a naval demonstration, make demonstration