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trying to think about what you're doing can quickly interfere, ending the automaticity and high performance level you've enjoyed. The easiest way to get someone to fall off a bicycle is to ask him to concentrate on how he's staying up, or to describe what he's doing. The great tennis player John McEnroe used this to his advantage on the courts. When an opponent was performing especially well, for example by using a particularly good backhand, McEnroe would compliment him on it. McEnroe knew this would cause the opponent to think about his backhand, and this thinking disrupted the automatic application of it.