There are two relevant senses of the adjective. The first, a commonplace in British sport commentary, is more frequently expressed in the U.S. in the phrase physically fit. But the shorter form is creeping through, thanks in some measure to tennis players, announcers, and reporters, who are partial to it. Thus the New York Times last year quoted Dominika Cibulkova of Slovakia, who had commented that Samantha Stosur “played like a man.” Asked to clarify, Cibulkova said, “As a player, she’s very fit. I’m not saying anything bad.”
A British reader of that quote may have had the impression that Cibulkova fancied Stosur, as the second British meaning of fit is “sexually attractive. The OED cites this 1985 exchange from The Observer: “Better ‘en that bird you blagged last night.’ ‘F—— off! She was fit.’”
I had never encountered a U.S. use of the second fit till this morning, when New York Times media correspondent David Carr sent this out over Twitter:
Now, it’s possible that Carr was merely imagining a United Parcel Service employee who regularly went to the gym. But where’s the fun in that?