Riposte

A bit of a story based on John's list from "A Study in Scarlet" that says Holmes is "an expert singlestick player, boxer, and swordsman."

He really is amazingly fit, now that John is getting a good look at him for the first time without a shirt on, lean and well muscled with smooth, clear skin scattered with a few freckles here and there. He doesn’t go to the gym, John doesn’t think, but he isn’t sure just how he keeps himself looking like that. John thinks of his ruined shoulder and sighs, the limited movement and residual pain keeping him less active than he wishes he was.

How John might percieve Sherlock in the early days of their association, when Sherlock is still so physically perfect, and John is not.