I've been working my abs intensely for a year and seven monthes now. I have definetion in my abs. Basically the V, but I an unable to obtain the six pack (individual muscles in the abdominal region) My ab workout consists of 100 crunches on a generic crunch machine and 90 oblique crunches on each side. I do this 6 days a week, only on the sixth day I also add an assortment of leg lifts and medicine ball situps and stuff. I switch it up all the time. I don't do any cardio, because I'm trying to build mass. Any tips or comments welcome.