how to gett a 6 pack?

im 5’6″ and about 160lbs, i’ve been doing about 25 crunches everyday for the past 2 weeks and im starting to slowly feel the results, i can’t see them though. will the 8 minute ab workout on youtube help me get a 6 pack?
could i do all this twice a day every other day? on top of good cardio and good dieting?