A baseball batter rehearses his stance, grip, swing, and breathing; he studies the opposing pitchers; at the plate, he takes note of the wind and the position of the fielders.
As he begins to swing at a pitch, however, he ceases to be consciously aware of all this and focuses his total awareness on the ball.
This single objective channels all his energy into his action of the swing.
Having this single objective allows the batter to synthesize all his other concerns, and all his rehearsed and intuitive skills, into a single complete action of mind and body.
(Author unknown)