all bodybuilders work their abs.
but many bodybuilders do not do ab specific excercises as it is unnecessary, given the huge workload of other lifts they perform, and some believe it builds a thicker waist.
cardio is not necessary to get lean enough to show abs, however a calorie deficit is mandatory.
if cardio helps produce a calorie deficit, then go for it.
however, there is several studies showing too much cardio to be detrimental to bodybuilding goals (catabolic).
yes. i'm just saying i believe if you do big compound moves it is enough ab work to have a nicly developed 6-pack.
if you only do bicep curls then, yes some focused ab work would be needed to get developed abs.
i enjoy the discussion.