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There's no difference. Motion is is motion is motion.
Lay on your back and flail your arms around wildly for 45 minutes. You'll get sweaty as fuck and burn the same amount of calories.
I guess doing p90x or Insanity would both be equally more interesting than what I just said, so it doesn't matter which one you get. By the way, I have Insanity DVDs and did it for a few weeks last summer. It's good, and the background girls are hot.
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