Some teen girls have a fast metabolism: They're able to eat anything they want and not gain a pound. On the other hand, some teenage girls struggle with their weight, and they look for effective ways to lose belly fat.
Work on your abs and obliques with these core exercises for women. A 30 minute waist cinching workout to activate your obliques and define your waistline! http://www.spotebi.com/workout-routines/core-exercises-for-women-abs-obliques-workout/
The Military Diet.....In three days you should lose up to 10 pounds. After three days of dieting, you can eat your normal foods, but do not over do it. After four days of normal eating, you may start back on the 3 day diet again. You can lose up to 40 pounds in a month if this diet is followed precisely.