HIIT is a cardio session arranged as short bursts of very hard work. The whole point of high-intensity training is to kick up the intensity of your cardio. In order to qualify as true HIIT, you’ll need to push yourself to the max during every set. That’s why they’re short—anywhere from 20 to 90 seconds. It’s the opposite of going for a long run where you ration your energy. Now you’re ready to get the most out of your next HIIT session. If you’re not working your hardest, you’re not doing HIIT. ~ Berceste