Taken from GetMyInspiration4Life:
 
Bo Bennett said, "Visualization is daydreaming with a purpose."
If you were to hold a vivid, fearful picture in your imagination, your body would respond through the autonomic nervous system, with a feeling of uneasiness, upset stomach, elevated pulse and blood pressure, sweating and dryness of the mouth.
However, if you were to hold a pleasant, relaxing image in your mind, your body would respond with a lowered heart rate, decreased blood pressure, and relaxed muscles.
Remember, what the mind pictures and harbors, the body manifests.
So sit back, turn up your speakers enjoy the session and share it with those you care about!