By losing weight
in general a certain amt will probably be abdominal fat. However, we don't get to chose what area of the body the fat is lost from. 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.