I don't know that much about HIIT but here is a good study to read. From this you can make your own conclusions. My gut is that unless you are doing it for aerobic conditioning then no...AND if you are doing cardio after HIIT then you did your HIIT session wrong, I just about throw up when I am done.
http://www.oxygenmag.net/showthread.php?t=3365



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I normaly do cardio 1hr - 6 days a week Just thought The HIIT would help. 
