High intensity interval training, or HIIT, is a type of training that involves short bursts of high-intensity intervals of exercise combined with lower-intensity intervals. One example is all-out sprinting for 30 seconds between 60-second jogging sessions. One workout would involve five to 10 of those high-intensity cycles. This type of workout is designed to burn large amounts of fat in a short period of time.
That means taking in fewer calories than you burn. That means making healthier choices. That means ... well, you know what that means. You know what you should eat. We all do. White flours and white sugars are the enemy. Foods like white breads, cookies, white pasta, white rice, and white potatoes are out. (The same is true for "white fats" like butter and full-fat cheese.)
Here's something else most people probably don't know: Fidgeting is good for you. It's considered a nonexercise physical activity, and it's an important way to burn energy. You get more health benefits if, in addition to exercising, you are a more fidgety, more active person the rest of the day. This means gesturing while you're talking, tapping your foot, just moving around.