Your right no way I hell am I doing a hour of sprints! sorry I meant HIT cardio in intervals. I will warm-up and just walk for about 5 -10 minutes and then I'll run at about a 8:30 mile pace for 1 minute and then walk for a minute and so on. so I am not actually running for a hour straight more like 23 minutes and walking for 23 minutes. I do have to run 8:30 mile pace to get my heart rate in the 170-180 range.
I used to be a endurance runner with a few marathons under my belt so I can handle cardio ok it's simple doing a hour cardio for me when I used to have to run 3 hours a day and that was non-stop. so yes I did miss-word that no way in hell could I sprint for a hour these days. I figured most all bodybuilders do HIT cardio in intervals,actually some of them don;t even run for a minute they just walk it out.
intervals are a good way to do cardio
however what you describe isnt HIIT
HIIT is basically short warmup and short cooldown
and in between you do 30 to 90 second intervals or ALL OUT SPRINTING alternated with light jogging
not running, but sprinting all out until you think you drop, like 12-15mph or so
sucks to do it on a treadmill though because most cant switch around the speed with 1 button
do that for 10-20mins and youre DONE
10 intervals or 60sec sprint/ 60 sec jog and youre fucked, i promise