Quote:
Originally Posted by SilkySmooth
If your body fat is already low, and you already do situps, then I'd definitely recommend working on your transverse abdominals. They are a band of muscles that lie below the rectus abdominis (i.e. the 'six pack') and run horizontally round the waist like a natural girdle. Well toned transverse abs can give great definition as they pull the six pack in tight. They also help you do better at other ab exercises.
Try doing a set of planks. You hold your body straight on your elbows like below. Try 3 sets of one minute (with 30s rest in between) to start off with and see how you get on with that.
Remember to work out your lower back if you're working your abs. Hyperextensions are good for that. 
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Even though sites like this:
http://exercise.about.com/od/abs/tp/abexercises.htm
list the plank as "the best" exercise for the transverse abdominals (TA),
I think the vacuum exercise is considered better.
Here's the wiki on the vacuum exercise:
http://en.wikipedia.org/wiki/Vacuum_exercise
Basically, you just pull your navel in toward your spine as hard as you can and hold it in for awhile. The maximal voluntary isometric contraction at the movements end may be the most important part.
Here's a video of a guy doing it.
He does it after 17 seconds , so you have to watch for awhile.
He doesn't really hold it in long enough to work it toward fatigue, though, which isn't optimal, IMO.
But as I mention later in this post, may be moot anyway.
http://www.youtube.com/watch?v=OoPThdb_X98&NR=1
The Plank will work the TA isometrically, which is ok, too. But, just supporting your bodyweight probably won't stress the TA all that much. If you pile weight on your back, you're gonna have to tense harder to support it , which I'm guessing, may improve the effect.
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There's controversy brewing in the medical world about the ability, value and best way to strengthen the core muscles, especially the transversus abdominis.
Here's an excerpt from a paper titled:
the myth of core stability.
"
Doubts have been also raised concerning the effectiveness of many of Core Stability (CS) exercise in helping to increase the strength of core muscles. It has been shown that during CS exercise, the maximal voluntary contraction (MVC) of the “core muscles” is well below the level required for muscle hypertrophy and is therefore unlikely to provide strength gains [54-56]. Furthermore, in a study of fatigue in chronic lower back pain, four weeks of stabilisation exercise failed to show any significant improvement in muscle endurance [57]. A recent study has demonstrated that as much as 70% MVC is needed to promote strength gains in abdominal muscle [58]. It is unlikely that during CS exercise abdominal muscle would reach this force level [59]".
from :
http://www.ppaonline.co.uk/download/..._stability.doc
Which seems to imply you really can't affect the TA by doing the vacuum exercise I mentioned above.
But I'm not sure what exercises where done in the studies the author cites.
I only found that paper today, and I haven't yet explored the references.
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Finally, check out this pretty amazing video.
my final conclusion though, is this guy still doesn't have a typically visible six pack!
Which is all about skin thickness via reducing subcutaneous fat.
http://www.youtube.com/watch?v=Kylji...eature=related