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, typically. It’s the opposite of going for a long run where you ration your energy in order to sustain the activity for longer.
Numerous studies have shown that working your hardest is key when it comes to boosting endurance, increasing metabolism, regulating insulin levels, and losing body fat. “All exercise helps burn fat by burning calories,” says fitness expert and celebrity trainer Rob Sulaver. But, he adds, “more intense exercise burns more fat,” and that’s part of the reason HIIT is so popular.
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