OMG! This about routine is KILLER! And all you need are dumbbells!
But before you jump to the workout, I want you to remember that doing ab exercises like this is NOT the only component to abs.... and having abs is NOT the importance here. The importance is building a strong core so you can perform compound movements like squats, deadlifts, bench press, etc. with better form and control, and therefore lift HEAVIER!!!
And you don't NEED an "ab day" - you just need about 5-10min 3-4x a week after your MAIN workout! 10000000 crunches a day is NOT the key to abs!
So, here are some killer moves you can do at the gym or at home!
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