Have you heard of the latest fitness phenomenon that has folks working out like crazy six times a week? It's called P90X, and it's one of the top 5 fitness DVDs on amazon.com. The program, which some users consider to be more like a newfound religion, employs lifting weights using a technique called muscle confusion. This involves switching-up resistance training exercises so your body doesn't become accustomed to the same repetitive movements every time you work out. If your body adapts too well to your workouts, the theory goes, it won't build muscle as efficiently as when it's faced with unpredictable movements. Hence, the confusion

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Makes me wonder if these, diet and this one, are "fads" or do they really work?