The first triset of today's workout is built on some of my favorite core exercises. They may not seem difficult at first, but if you concentrate on doing the movements correctly, you're going to feel it!
Run through each of these exercises at a rapid pace, but don't move so quickly you sacrifice form. Use your mind-muscle connection to focus on your core contracting. Once you finish one triset, take a quick rest, then go for another round.
Once you're done with that, don't forget your cardio!