The 18 minute full-body routine on this DVD is awesome! (After about 20 minutes, I lose my focus anyways!) Every move engages your abs (love it), and they all focus more than one muscle group at a time. which feels great! (abs hate it lol!) It also has 4 other sections, but the full-body is my fave 18 minute way to torture (I mean sculpt) my abs. And because I'm a glutton for punishment and a tough Personal Trainer, I use 5# weights instead of the little hand weights she uses. Plus, I warm-up with a mini-power walk, and some jumping jacks.
So, try this one out, or try out a fitness ball. I'm a fan due to the versatility & effectiveness. Watch your posture, do moves slowly, and keep those abs tight. You'll thank me. (your abs won't.)