It does surprise me the number of people who fail to do what I call the basics at cricket and backing up (when batting or fielding) is one of them. I back up quite a long way when batting I startle some lads under half my age with a cry of "yes" from the non-strikers end. Only been out run out once backing up when a straight drive was deflected onto the stumps in a Sunday double innings game but I am willing to accept the risk although it almost happened in my 2nd innings of that game too.
However there's no better way to get the fielding side arguing amongst themselves than a fat old bloke running quick singles !!!