There are different types of HIIT but an easy one to begin with is to simply warm up for 3 minutes on an elliptical machine or by walking.  Then work out for 30 seconds so that at the end of the exercise you feel satisfied.  Reduce the speed to slow down to a moderate pace.  Do this 7 more times or for total 8 intervals. Start with one interval and as your body is ready to take more increase the intervals.  Studies show that HIIT to be the absolute premier cardio for weight loss and optimal health as compared to longer, traditional cardio.
Belly fat is excess abdominal fat surrounding the organs in your stomach. There are three types of fat: triglycerides (the fat that circulates in your blood), subcutaneous fat (the layer directly below the skin’s surface) and visceral fat (dangerous belly fat). Visceral fat is located beneath the muscles in your stomach and poses many dangers to your health when there is too much of it.
The most important thing you need to do is to program yourself mentally. Don't use a scale to measure your progress. If you work out with weights, you may gain a few pounds while losing inches around the waist. Instead, use that pair of jeans that you want to fit into again, or a pair that fits you now. You'll see a slight change every few weeks, and that should give you confidence.
Core exercises will strengthen your abs, but they won’t eliminate the fat that lies beneath them. To do that, you have to ramp up your overall calorie burn with cardio (running, walking, biking). A Duke University study found that people who did moderate cardio for 178 minutes per week (roughly 30 minutes of walking six days per week) gained hardly any visceral fat over the course of eight months. Participants who worked out at a higher intensity (jogging) for a similar amount of time saw even better results — reducing their belly fat by almost 7 percent. To maximize your workout, try interval training, which alternates between high- and low-intensity cardio.

Snack on portion-controlled fruit, seeds and nuts. One study found that snacking on 42g of almonds per day (instead of munching on something high-carb with equal calories) helped to reduce belly fat and improved cholesterol levels. “The high levels of fibre are proven to combat excess calorie consumption later in the day,” says registered dietitian Lucy Jones.
Many exercisers wonder if sit ups burn belly fat. If you're like most frustrated exercisers, you do countless crunches and see only a small result. It may cause you to question the purpose of sit ups. Well, wonder no more. Here's the low down on the popular exercise. Find out what sit ups can and can not do for your belly before you invest any more time or energy.
The body doesn't react to all fats in the same way. Research correlates high intake of saturated fat (the kind in meat and dairy) to increased visceral fat, says Patton. On the other hand, monounsaturated fats (the kind in olive oil and avocados) and specific types of polyunsaturated fats (mainly omega-3s, found in walnuts, sunflower seeds, and fatty fish like salmon) have anti-inflammatory effects in the body, and if eaten in proper portions may do your body good. But Patton warns that eating too much fat of any kind increases your calorie intake and could lead to weight gain, so enjoy healthy fats in moderation. 
Instead of satisfying your sweet tooth with some refined sugar, turn to berries and enjoy a slimmer waistline in no time. Berries are loaded with antioxidants, which can help reduce inflammation throughout the body, and research from the University of Michigan reveals that rats given a berry-rich diet shaved off a significant proportion of their belly fat when compared to a control group. Berries like strawberries, raspberries, blueberries, and blackberries are also loaded with resveratrol, an antioxidant pigment that has been linked to reductions in belly fat and a reduced risk of dementia, to boot.

Visceral fat is the hard body layer of fat that lies deep within our abdominal cavity and surrounds a number of internal organs such as the lungs, heart, intestines, liver, and pancreas. Visceral fat produces an inflammatory substance called cytokines that can damage these organs. Too much visceral fat can contribute to many health problems such as glucose intolerance, hypertension, coronary artery disease and type 2 diabetes.

Noam Tamir, C.S.C.S, founder of TS Fitness, also says that metabolic resistance training and high-intensity interval training is a solid way to reduce fat all over, including belly fat. “These [types of exercise] help to burn calories during the workout, and they also give you that after-burn effect,” he says. “Plus, they help to change your body composition by increasing your muscle mass.”
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