I think abs training is certainly necessary....
I've said this before. Did you ever see pictures or video of the guys in Prisoner-Of-War camps? They're skinny as anything.... have pretty close to ZERO bodyfat. Yet most of them don't have any ab definition.... why? Because even with no bodyfat, you need to have some muscle there. That's why ab training AND diet go hand-in-hand. On the other hand, at the end of my bulking phase when I was carrying a lot of fat, my abs were still visible because my ab muscles were sticking out.... and even though there was fat covering them, the shape was still there.
I think once or twice a week is fine for abs. They're easily overtrained, I hear.
I think the best exercise is leg-raise stuff. I especially like hanging knee-raises. But the trick is, don't LOWER your thigh past parallel.... starting position should be with your thigh parallel to the floor. Then bring it up as high as you can, and go back to parallel. Then when you can't do anymore, do regular leg raises with the full range of motion.... it's like doing forced reps, kinda. You'll get a lot more benefit from them by doing them that way. You can twist to the side a bit and do the same thing, which will focus more on your obliques and serratus.... that's what I do for lower abs, and also some decline board leg raises.
For obliques and middle abs, I do... these weird crunches that Levrone does. Where you're kinda laying a bit on your side. I dunno how to describe them. They work good.... and standard crunches or crunch machine or whatever for upper abs. Upper abs is kinda whatever works for you.
But try the hanging knee-raise thing I suggested. It works real good.
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