High Intensity Interval Training, which is also abbreviated as HIIT, is a form of cardio where you go all out for a short period of time, and then rest for a while, repeating this cycle multiple times. Numerous studies have shown that HIIT is actually far better for fat loss, and overall health, than steady state cardio. And, you can save time doing it.
What does a HIIT workout look like? You could jog for two minutes, sprint for one minute, jog for two minutes, sprint for one minute. Or you could do a HIIT workout on a bike, or by running up stairs and then jogging back down. The key is that you go relatively all out for a short period of time, then recover by maintaining a moderate level of intensity, then go again.
The 30-Day Shred workout was designed by celebrity fitness trainer Jillian Michaels. This weight loss DVD comprises three 20-minute circuit training workouts that are based on Jillian's 3-2-1 interval method. Each circuit alternates among three minutes of strength training, two minutes of cardio and one minute of core work to effectively burn fat and lose up to 20 pounds within 30 days. In order to lose weight with Jillian's 30-Day Shred series, you'll need to incorporate a sensible diet that allows you to consume the appropriate amount of calories and healthy foods in order to reduce body fat.

Incorporate at least two additional days of exercise -- cardio, yoga, or Pilates -- outside of the three workout days that you perform the 30-Day Shred program. According to the Centers for Disease Control, adults between the ages of 18 and 64 require 150 minutes of moderate intensity aerobic fitness every week and two to three days a week of strength training.
"Only doing abdominal-focused workouts, like crunches, won’t help you banish the bulge. Belly fat is simply where your body stores energy, so you need to take a whole-body approach to tackle it. HIIT training (high intensity interval training) is a great way to burn fat and get your heart rate up. Squats, burpees and treadmill sprints are all examples to try."
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