so you're saying you can isolate different parts of your abs? As bblazer said, there is only 1 abdominal.
Maybe I'm wrong- if i am please correct me.
Yeah your right, you cant isolate one part but the idea is you can put more emphasis on one part than the other.
Its debateable though, its the same as being able to work upper, middle and lower chest. I have always said that as there are no heads to the muscle you cant work one more than the other, but there have been times where for example Iv done alot of dips and the next day the lower part of my chest has been the only sore part. Or after leg raises my lower abs being sore not my upper etc
So to be honest I dont know if you can put emphasis on one part or not...