If you are looking to flatten your lower stomach you should read all about the lower abs.
http://AskTheTrainer.com/best-lower-ab-workout.html
Lower ab exercises are not enough so you should check out core exercises.
http://AskTheTrainer.com/best-core-exercises.html
When it comes down to it, diet is the most important aspect of obtaining six pack abs.
http://AskTheTrainer.com/six-pack-abs.html
