Admittedly, I have doing my cardio at low intensity, long duration pace. I have been informed in the error of my ways, lol. Anyways, I was on the eliptical tonight and attempted some HIIT. The first minute was at a moderate/slow pace(about 130 HR) then the second minute I went as fast as I could for another minute(around 175HR). I always did the "fast" part in 1 minute intervals with 1 minute or 1:30 "slow" intervals in between. I did this for about 18 minutes with my HR ranging from 140-180 through the intervals. Was I doing it correctly or was I way off ?