text: flat stomach plzz!!? i know how to get a flat stomache : cardio , low cal diet , situps and junk. my stomache is pretty flat but has a little pouch thing. how long untill it will go away if i do all the right stuff? i had a 'pouch' too, i decided i would do 100 sit ups a night, and every night add 5 more. after about 2 weeks i saw a reduction, 4 weeks and it was gone. i didn't change my diet at all, and it wasn't really that bad, but maybe if i had i would have seen a bigger change sooner.  so my advice to you is to follow that exercise plan, and cardio and low cal diets will only make it go faster. although, you should know that it does vary per-person.