This is a pretty decent abs exercise video:

http://www.youtube.com/watch?v=Xn6eGhGv1zo


It's 3 sets for each exercise with 1 set = 15 reps.

1.a Traditional crunch (15 reps)
1.b Crunch but reaching Left (15 times) then right (15 times)
(using a performance disc)

Do that 3 times.

2.a Holding a 5lb medicine ball with knees bent and lifted off floor, twist tapping the ball to the floor from left to right. At the end hold the ball in the air.

Do that 3 times

3.a Lie on floor, with legs extended up to air, crunch. 15 times.
3.b Same thing but reach left, then right (15 times each)

Do that 3 times