I am in love with this app! I downloaded it and even after the first workout, I felt a difference! After about 4 weeks my abs looked great! I use this app almost every day and it works wonders! I love that the app allows you to edit your own workouts so once your muscles start building, you can add to the workouts!
The only issue was that there was occasional crashing; nothing too bad, however.
If you really want a toned midsection, this app is perfect!
Borneo3 about Ab Workouts App