Benefits of ab exercises??

Since i cannot spot reduce and I need to get my body fat down to see ab muscles, what exactly is the benefit in training my abs?

I typically dedicate some time a few times per week to my Abs and I already have considerable definition from losing so much weight. Is cardio the key or do I need to do both. My main concern is the fat underneath my navel and since I can recall having it all the way back to my youth I'm sure that will be last to go.

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