First off you've got hardly any muscle. Abs are just like any other muscle group, you need to excercise them, but allow them time to rest/repair...Honestly the best things you can do are front squats, deadlifts and other heavy core activating workouts. Crunches are not the answer I'll tell you that much. That said though build muscle to reveal them with a low body fat...and getting a low body fat is proper nutrition (some call it diet).
You must be fairly tall to have no muscle and be that small and still weight around 180.
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