This is a perfect little add on, or if your short on time, just anytime, fast, full body workout! HIIT stands for High Intensity Interval Training, and what that means is short bursts of all out effort mixed with periods of rest for a certain time period. Doing HIIT is a great way to either compliment your already workouts if your training for something, help you to get to the results you want to see faster, or can just be used as a stand alone great workout by itself! All the workouts are laid out for you and explained as well as a video to go along with it. This is a workout that is for everyone as you are the judge of your own intensity!