ἀλλὰ σὺ μὲν νῦν στῆθι καὶ ἄμπνυε → but you, stop now and catch your breath | but do thou now stand, and get thy breath
adv.
Seated astride on: V. βεβὼς ἐπί (gen.), ἐμβεβώς (dat.).
Be seated astride on: use sit on.