This is not a list made by me or by some self proclaimed fitness expert. This is list of most effective abdominal exercises determined in a study commissioned by American Council on Exercises. They have listed each exercise with % of activity on Rectus Abdominus and Obliques.
So whats the point in this post?
We are listing them with link to video demonstrations on how to do them correctly. Hopefully you can determine which exercise is best for you based on your physique.
Most Effective on Rectus Abdominus.

RANKING	EXERCISE	Mean % of ACTIVITY
1	Bicycle Maneuver	248
2	Captain’s Chair	212
3	Exercise Ball	139
4	Vertical Leg Crunch	129
5	Torso Track	127
6	Long Arm Crunch	119
7	Reverse Crunch	109
8	Crunch with Heel Push	107
9	Ab Roller	105
10	Hover	100
11	Traditional Crunch	100
12	Exercise Tubing Pull	92
13	Ab Rocker	21

These are the most functional exercises on OBLIQUES

RANKING	EXERCISE	Mean % of ACTIVITY
1	Captain’s Chair	310
2	Bicycle Maneuver	290
3	Reverse Crunch	240
4	Hover	230
5	Vertical Leg Crunch	216
6	Exercise Ball	147
7	Torso Track	145
8	Crunch with Heel Push	126
9	Long Arm Crunch	118
10	Ab Roller	101
11	Traditional Crunch	100
12	Exercise Tubing Pull	77
13	Ab Rocker	74

Some video demonstrations are missing and we will be adding them soon.
As you can see the Captain’s Chair and Ab Bicycle maneuver are most helpful in strengthening both Rectus abdominus and obliques. Therefore these two are recommended and mostly ab bicycle maneuver doesnot require any special equipment except doormat..

Best Six Pack Abs Training Book with lots of workout routines to get six pack abs efficiently with great meal / diet plans to cut those extra calories and get awesome six pack abs.

Tagged: abs workout