The problem with this is you can't spot reduce fat. If you do the 8 minute video and dont change your diet (assuming it's not a good one), you won't see good results.
Abs are like any other muscle. If you want them to be stronger, slap a 45Lb (or whatever you can handle) plate on your chest and do crunches, and no more than 3 times a week. And be smart about it, do 2 or 3 sets max with between 8 and 12 reps.
If you want more definition, lose fat. Yeah, working the abs will make them a little bigger, and thus sometimes easier to see.
Another thing to consider is that abs are genetic. Not everyone is able to get a 6 or 8 pack.
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Mokle
"Your hands can't hit what your eyes can't see" -Ali
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