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you can google it . is high intensity cadio, like reallllllllllyyyyyyyyyy intensity. http://www.youtube.com/watch?v=GchiVhhjKGo
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Insanity is hard core, what i think is you have to find something that you think you can do "forever". bike everyday, or swim everyday even walk everyday... when ppl do something that is too hard they tendency to give up. the trick for a nice body is consistence, its must be part of you daily routine. i like to do insanity…
