I want to flatten my stomach, without it looking too 6- pack muscular. any suggestions?

Low carb diet: For a flat stomach you must keep your weight down. The best way to keep your weight down and keep your metabolism revving is by avoiding excessive carbohydrate intake. Excess carbs increase insulin, estrogen, and reduce thyroid metabolism.

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.)