Michael Adams told me that his results improved considerably when he conquered his 'walkabout' problem, and that lots of players let themselves down by wandering around. I suggested that stretching legs, going to the toilet, or getting refreshments were essential for some players, to which he replied that he used to think that too, but one day he realised that he was deceiving himself, and his main motivation for leaving the board was actually to alleviate boredom! Jonathan Rowson, The Seven Deadly Chess Sins