Her smirk only twitches at that defensiveness. Take it easy before you hurt yourself son!! Maybe the teasing was a little unnecessary; obviously he isn't in a bad shape, but she doesn't get the impression he's one for regular work-outs, either.

"I'm not worried about that," she dismisses his chivalry -- or whatever -- and takes a sip from her cup before offering impulsively, "Well, let me know if you ever want to spar or something."