Deriving, it is said, from the expression 'as subtle as a sledgehammer', sledging is the abuse of someone on the other side - usually directed at a batsman by the close fielders. The motive for this is, of course, to disturb the player's concentration. Sadly it has become commonplace in the professional game and, while it can sometimes be quite amusing, umpires have to be alert at all times to ensure that it does not constitute an attempt to distract or obstruct the batsman.