Plato, Laws 815a

ὄρχησιν λέγοι. τὴν πολεμικὴν δὴ τούτων, ἄλλην οὖσαν τῆς εἰρηνικῆς, πυρρίχην ἄν τις ὀρθῶς προσαγορεύοι, τάς τε εὐλαβείας πασῶν πληγῶν καὶ βολῶν ἐκνεύσεσι καὶ ὑπείξει πάσῃ καὶ ἐκπηδήσεσιν ἐν ὕψει καὶ σὺν ταπεινώσει μιμουμένην, καὶ τὰς ταύταις ἐναντίας, τὰς ἐπὶ τὰ δραστικὰ φερομένας αὖ σχήματα, ἔν τε ταῖς τῶν τόξων βολαῖς καὶ ἀκοντίων καὶ πασῶν πληγῶν μιμήματα ἐπιχειρούσας μιμεῖσθαι· τό τε ὀρθὸν ἐν τούτοις καὶ τὸ εὔτονον, τῶν ἀγαθῶν σωμάτων

being distinct from the pacific, one may rightly term pyrrhiche; it represents modes of eluding all kinds of blows and shots by swervings and duckings and side-leaps upward or crouching; and also the opposite kinds of motion, which lead to active postures of offence, when it strives to represent the movements involved in shooting with bows or darts, and blows of every description. In all these cases the action and the tension of the sinews are correct when there is a representation of fair bodies and souls