For the one who asked for more info, here are plenty of articles:
http://www.bodybuilding.com/fun/bbinfo.php?page=HIIT
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Originally Posted by Siege
As with all exercises, when your body first encounters it, you'll have difficulty. But after a while, your body will adapt.
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And then it is time to change, or else the effect will be minimum. Just remember, never let your body get used to any exercise, you have to be creative.
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As for me, I try not to do too much cardio, because I seem to lose weight very easily.
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You should, cardio is very important.
I never tried HIIT to be honest, I only have 6,4% body fat in me. But have seen others doing it, and it seems a good way of training for those who want to burn fat.