For most people, concentrating on the lower abs first is a great workout strategy. Why? Your lower abs tend to be more stubborn than the upper portion in terms of strength and definition. Once you get perfect lower abs, you can gradually move onto the upper ones. The following exercises concentrate on the muscles on the lower portion of the body. They focus the lower abs and best of all, your upper abs will also get some work done with these moves!
To start, lie faceup, legs extended, feet together, arms extended overhead. Inhale, and as you exhale, squeeze abs and raise right arm and left leg, touching hand to foot. Inhale and slowly lower to starting position. Repeat for 15 seconds, then switch sides for 15 seconds.