What would be the best way to have a flat stomach fast?

Eat less; do sit-ups: To help the tummy look flatter, one can do exercises to build very strong abdominal muscles. It will take a lot of work, and will burn off calories. One must not eat more calories than she burns off, or she cannot lose weight. Helpful weight loss foods are natural foods that take time to chew but contain few calories. Examples include carrots, celery, and iceberg lettuce (without salad dressing).

Abs: Eat healthfully ; be physically active. Calories burned must > calories consumed. To tighten ab's do crunches, reverse crunches, exercise ball crunches, pelvic thrusts, lying leg raises, side bridge ; “bicycling” exercise on your back. Engage in regular aerobic exercise.