The 15-Minute HIIT Ab Workout Here's a quick rundown of this 15-minute HIIT ab workout. Perform three rounds with working intervals of 45 seconds and rest intervals of 15 seconds.
High-intensity interval training, or HIIT, is a great way to torch calories, boost your metabolism and get a great workout in a shorter amount of time. And if you're a fan of hopping on the ...
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