Best ways to maintain abs?

Minxxie
I always had a flat tummy before but this summer I worked a hard labour job from hell!!! And what I did get out of the terrible job was more toned abs that are actually quite visible, and now I've grown quite attatched to my post-helljob stomach. Since I kind of got abs by accident or without realizing, I have no clue how to maintain them! Anyone have links to excersises or methods you use?
Best ways to maintain abs?
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