I FINISHED THE 30 DAY PLANK CHALLENGE!! I saw so many improvements in myself that I wasn't expecting, and I learned a few things about myself too. First of all, if you're going to embark on a 30 day fitness challenge, you have to be IN IT. And you're going to WANT to be in it, because your body will transform in ways that will surprise you! For me, I was expecting to be able to get better at holding the plank. And maybe a little bit stronger of a core, whatever that meant. OH MAN, was I…