flat tum

what is the best way to get a flat tum.

which excercise has the best results

i have a ab-roller, but it really doesn't seem to work, or maybe it would if i used it, a bit more.

Didn't want to read and run, but don't have too much to add. I think generally with weight loss alone will flatten the tummy, but if you're trying to get a 6 pack then maybe your ab roller or some sit ups. Have you checked out Billy Blanks boot camp for abs? I've tried it and it kicks my a$$ every time.