Insanity Workout - the hardest interval workout [review]

Insanity is the hardest 60 day workout ever put on DVD. This workout is an upside down interval training using maximal heart beat frequency. Get ready, because this will be insane!

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Insanity Workout - the hardest interval workout [review]

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Insanity Workout - the hardest interval workout [review]

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INSANITY - THE HARDEST WORKOUT ON DVD