What is a good abs workout?

Okay, so, I was Surfing YouTube looking for good ab workouts myself. Then, I came across a 5 minute Insane Abs workout. I thought it was a load of bull, but I decided to check it out. IT ACTUALLY PROVIDES INSTANT RESULTS! Now, I'm not talking, like, get flat abs in 5 minutes, but it shrinks your stomach every time you do it! What makes this workout different from the others, is that it's a combination of different ab workouts, not just one. And, it's 5 minutes of nonstop ab toning. So, I bet you would like to know more. Well, just go to daveywaveyfitness on YouTube, and when you're on his channel, find 'INSANE Abs in 5 minutes!'Good luck!