Here is an interesting article about getting that “beach body”. The catalyst for the article is Chaske Spencer, the star of Twilight: New Moon, who put on 20 pounds of muscle in 3 weeks in order to get ready for the role. He attributes the success of the work out to “muscle confusion” which changes the work out routine on a regular basis thus confusing the muscle to work harder.
You might have heard about muscle confusion if you watch TV late at night. P90X is an exercise program that is based on the same principle.