It is important to realise that there is no such thing as “spot reduction”. In other words you can’t just perform exercises for the body part you feel is carrying too much fat and expect it to move from here. It works metabolically. Body fat is put on all over your body and comes off from every part also. A proper training routine and nutrition plan will keep your metabolic rate high so that you will be burning off any excess body fat and any excess calories you ingest. Doing abdominal work will firm up the muscle tissue but you may still have a layer of unwanted body fat over this. You need to also do exercises that work each individual muscle group to keep the whole body in shape and keep the metabolism high which keeps you lean all over and also gives you excellent energy (both physical and mental).