yeah, low bodyfat is key, I would say less than 12% or better would be ideal, but not everyone is really going to get the 8pack, even with a low bf%, you would need weights to develop the muscles to accentuate them ( I like medicine ball tosses on an incline bench). Also, yes you will gain some benefit from isometric type exercises, try sucking in your stomach trying to touch your belly button to your back and hold it, repeat.
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"Religion is the one area of our discourse in which it is considered noble to pretend to be certain about things no human being could possibly be certain about"
--Sam Harris
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