Nutrition, genetics, cardio exercise, and strength training may help get rid of the pouch. You cannot spot train.
Another poster mentioned planks - absolutely! They work on the TVA (transverse abdominus) muscle, which sort of 'wrap' around the midsection. The muscles are deep and act like a corset or girdle. Tighten and tone them and they give the appearance of a narrower waist. HOWEVER...you can have a six-pack of abs but still have them be well insulated if there is a layer of fat protecting them. You can't spot-exercise them off but good overall cardio can help.
All the situps in the world won't help much if you don't address the fat on top of it through nutrition.