Ooh, I should really like to learn how to box, sir...!
And as for what I could offer, as far as Teaching, well -- there is the jujitsu, though... I don't exactly have any sort of "belt" in it, of course... I mean, I only learned it in Auror training, on account of how the takedown classes were taught; I mean, we never qualified for "belts" or anything of the sort -- we just sorta -- well -- qualified, full stop: for the programme!