By losing weight
in general a certain amt will be abdominal ; leg fat. 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. Get regular aerobic exercise
. (i.e., running
, nordic track, .