P90X vs P90X2?

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Hi all,
So my boyfriend and I are trying to get back on our weight loss journey, and we've been catching glimpses of P90X2 here and there. He's already done P90X, so he wants to switch it up. I, however have not. So, my question...is P90X2 a sequel with more advanced moves, or is it just an alternative to the repetition of the first one?

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