High-intensity interval training is now in fashion, offering one of the most effective workouts for burning calories, losing weight, and regaining shape. These tight intervals (usually 10-60 seconds long) take you to a new level of intensity, beyond your comfort zone, when your body can burn tons of calories. A subsequent rest period (sometimes of the same length or longer than the intensity interval) allows you to recover so that you can do it all again ... and again ... and again. Traditional HIIT workouts are difficult, but if you're looking for a workout that pushes you to the absolute limit, don't look for anything other than a TABATA workout .

In our quest to become slim and physically attractive, we often resort to functional training. If you have been thinking about how to speed up the breakdown of fat and achieve maximum results in the shortest possible time, most likely, you are already alternating segments of high-intensity cardio loads with short...