Love it that we can look up videos on how-tos for exercise moves. This is a great exercise, they say, for the core. My core is trashed. So having watched a couple of skinny moms doing planks I think I can do it too. Oh, wait. I'm supposed to do more than one? Talk to me, people. How am I going to be able to hold the door shut against the zombies if I'm weak sauce? I want to know: do you plank? Which one, beginners, next step up, full plank, what? I want to read about your success.