The Best and the Worst Ab Exercises

Best to Worst Exercises for Strengthening the Rectus Abdominis:

1. Bicycle Crunch Exercise
2. Captain's Chair Exercise
3. Ab Crunch on an Exercise Ball
4. Vertical Leg Crunch
5. Torso Track
6. Long Arm Crunch
7. Reverse Crunch
8. Crunch with Heel Push
9. Ab Roller
10. Plank (Hover) Exercise.
11. Traditional (Basic) Abdominal Crunch
12. Exercise tubing pull
13. Ab Rocker

Best to Worst Exercises for Strengthening the Obliques:

1. Captain's Chair Exercise
2. Bicycle Crunch Exercise
3. Reverse Crunch
4. Plank (Hover) Exercise
5. Vertical Leg Crunch
6. Ab Crunch on Exercise Ball
7. Torso Track
8. Crunch with heel push
9. Long Arm Crunch
10. Ab Roller
11. Traditional (Basic) Abdominal Crunch
12. Exercise tubing Pull
13. Ab Rocker

Reference: http://sportsmedicine.about.com/od/abdominalcorestrength1/a/Best_Ab_Ex.htm