I do this abs workout every other day:
1-Feet Slide Cardio Abs-25 reps.
2-Leg Aside Abs-25 reps.
3-Feet Slide Cardio Abs-25 reps.
4-Kayak Abs-40 reps.
5-Swimmer Legs Abs-40 reps.
6-Wheeled Abs-35 reps.
7-Triangle Abs-30 reps.
8-Crossed Abs-80 reps.
9-Inverted Abs-60 reps.
10-Lifting Bar Abs-25 reps. + 25 reps.
11-Wheeled Abs-35 reps.
12-Triangle Abs-30 reps.
13-Crossed Abs-80 reps.
14-Inverted Abs-60 reps.
15-Lifting Bar Abs-25 reps. + 25 reps.
16-Wheeled Abs-35 reps.
17-Feet Slide Cardio Abs-25 reps.
18-Leg Aside Abs-25 reps.
19-Feet Slide Cardio Abs-25 reps.
20-Kayak Abs-40 reps.
21-Swimmer Legs Abs-40 reps.
I only do 2 brakes of 4 seconds between the 2 variations of lifting bar abs.
This is an 805 reps. workout but actually it's a less than an half hour workout and if you workout for a long time already you can reach this level in a few months.