If Matt notices what he said now that Tony's parroted it back to him, he doesn't respond beyond flashing him a smile of his own before lapsing into silence. The latter persists until he poses the question about warming up.

"Let me stretch out a little, before we start?"

He's sure he's stiffer than he realizes, from his injuries (and healing from them) and however long of more or less just sitting around, now. Having a few minutes to try and banish that, albeit, yes, much less ridiculously than Clint, will definitely help.