This should not be discouraged. When we are day-dreaming we are in a theta brainwave state. This is when we are at our most creative. Visualization Visualization is particularly important when training for an athletic event or a sport. When seeing yourself performing, even though your body is not actually moving there are minute muscular contractions occurring which develop neural pathways in the brain so that you become used to the movement visualized.
Most sports require specific movements, e.g. racquet sports, football, martial arts.
The brain remembers these movements so that with more regular use the movements come easier. The brain quickly forgets these movements, too. This is easily observed when returning from a holiday, when you notice you are a little rusty when participating in your usual sport. Visualization will help develop the correct neural pathways to make your sport more familiar to you. The movements will become second-nature and you will not have to think of them while performing they will come naturally.