Is it effective to work out your abs by flexing them throughout

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Is it good to flex your abs all day to practice keeping your abs

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Why I can't flex my abs after a good workout, is it because of

When I lay down my abs look good but when I try to flex them they

Is flexing my abs, releasing and repeating giving my core a workout? If I do it often enough, will this make my abs more defined? - Quora

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