So, back again, Harry?" Harry felt as though his rectus abdominis had cramped after a burnout session on the abdominal core machine. He looked behind him and, sitting on one of the desks by the wall, was none other than one flexing Albus Dumbledore, muscular arms oiled and glinting in the moonlight. Harry must have walked straight past the magnificent old lifter, so desperate to get to the mirror he hadn't noticed him.
"-- I didn't see you, sir."
"Strange how nearsighted being buff can make you," said Dumbledore, flexing his triceps to show off his recent gains, and Harry was relieved to …