That sounds like a perfectly fine exercise regiment. P90X is 6 different exercise routines 6 days a week (chest and back, jump training, shoulders and arms, yoga, back and legs, and kenpo). After you've spent a few weeks getting used to one set of 6 routines, the program shifts to 6 new videos featuring new exercises that focus on new areas. After that's finished, there's a third program of exercises. The theory behind it is muscle confusion, where you change your routine so that your muscles can't totally adapt to the exercises. I'm not 100% sure of the science behind it, but the results do seem consistent for those able to stick to it.
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