So you know the basics: the crunches, the v-sits, the sit-ups, planks, etc. An additional way to work on your abs is while you are doing other tasks like sitting at your computer or driving in your car. You can do a little pulsing motion, tightening and releasing your abs as you breathe in and out.
I figured that you'd probably have times when you literally have a couple of minutes, and just want to get something in. You can combine the two things I mentioned above (the abs exercises with the pulses) to get a quickie. I found the video below on Youtube that combined the two. Use it for your quick abs exercises. We will be releasing some more Eights & Weights videos soon.