As I sit down to write this post, my abs are on fire. Not literally, of course, but they are burning with exertion. It’s that good kind of pain…just don’t make me laugh tomorrow. Ready to know why? (I know one of you wise guys is out there saying, “nope, not really!”) I just finished an itty-bitty, 6-minute Pilates video on YouTube. Six. Minutes. That’s all it took. You’d think it was my first time working out, but no. Now, generally speaking, I’m in pretty decent shape. I run 3 days a week and ride the bike 2 days a week. That’s not bragging, it’s just that exercise is pretty much…