The Best HIIT Workout to Lose Fat (At Home) The best high-intensity interval training workout to reduce belly fat is a combination of fat-burning exercises that build muscle too. If you'd like to learn how to reduce your belly fat, your weight on the scale, and your overall caloric intake this video will help. Burn fat faster than ever with these simple but effective fat-burning exercises. For more free educational videos,science-based articles, and to get the best programming for your body type