Anyone working out to P90X - Lean?

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I just got the P90X and I want to do the Lean section since its more cardio. Is anyone or has anyone done this? Just curious if I need to eat more calories...Im at 1500 now. A friend burnt it for me so I don't have the plan for it. Also, I have heard that in the beginning you can gain weight? Does it make you bulky?? Thanks!