Any tips on flattening your belly that looks like a pregnant woman's but you aren't having a baby?

Core strengh Exercis: A good balanced diet with proper nutritional supplements and course of exercise perhaps emphasizing core strengthening under supervision of a personal trainer performed over a period of time to allow reasonable recuperation from the effects of pregnancy ( a minimum of 4-6 months) is a reasonable approach. I tend to recommend/prefer the use of pilates & yoga regimens with temprorary use of binder.

Lose weight: For flatter abdomen eat healthy & get physically active. Calories burned > calories consumed. To tighten ab's: crunches, reverse crunches, exercise ball crunches, pelvic thrusts, lying leg raises, side bridge & “bicycling” exercise on back. Engage in regular aerobic exercise (i.e. running, swimming, Nordic track, bicycling, kickboxing, walking, cross country skiing, hiking, etc.)