Importance of Great Abs:
Abdominal muscles are important for freedom from lower back pain and injury. Many lower back problems come from poor abdominal development rather than weak spinal erectors. Secondly great abs look fantastic! Great abs tell others straight off that you are fit and care about your health and personal appearance. Thirdly, strong abs are a key to improving performance in many sports.
How often should you train your abs?
Stomach exercises are best done every other day. A basic routine of 3 sets of 20-25 repetitions, keep the tempo up, if one of your goals is to burn the fat on and around your stomach. Make sure you drink plenty of water afterwards to help cleanse your body.
You are what you eat
For definition to be noticeable so you can see the contours and grooves in your abdominals, you must have a low body fat ratio. The reason very few of us possess good abs is because we have too much fat covering our waistlines.