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 - THE HARDEST WORKOUT ON DVD

Insanity Workout Free Download-Full Deluxe DVDs - Free Insanity Workout In case I ever have a scratched dvd! Please follow the guy who …

Insanity Workout - the hardest interval workout [review]

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