30 day Plank Challenge Starts Tomorrow!

I have issued a 30 day Plank Challenge. Are you asking yourself what is a plank? Plain and simple, an alignment of your body so you are much flat (like a plank of wood) as you can be. There are several different varieties (bent elbow, high plank, side plank, kneeling side plank, incline plank, twisting bent elbow plank, just to name a few). I have issued an bent elbow plank. You can do this off your knees or on your knees (you aren't really on your knees, but that is another conversation).
So, who is in?