The 30-Day HIIT Makeover is a 4-week commitment in reshaping your body and views on approaching fitness. Each workout takes fewer than 20 minutes to complete, and you'll certainly see the power of dedicating a short amount of time in your day to a non-stop workout. When it comes to HIIT, you burn fat and increase strength, while toning and tightening your entire figure. By day 30, you'll see how far a little bit of time and a lot of effort can get you.