Your 8 minute ab thing looks like a good plan for building strength and endurance in your midsection.
But it's easy to make them pop if you just do 12 to 15 reps of 3 sets of crunches, leg raises, side bends about 3 to 4 times a week. If that isn't hard for you, add weights... Intensity gives you more mucles size to make the abs pop out more so than more repettition.
But you probably already have the muscles.