I hit my abs pretty hard today. After my shoulder/biceps routine I went straight for the medicine ball and did 3 sets of 20 crunches. In between sets I did planks, holding my position for 1 minute. At the moment, my abs don’t feel horribly sore, but I’m hoping that will change come the morning. I gotta say, doing planks is fun. Yes, I know that sounds twisted, but I like the challenge.