Hi Dave,
My name is Aimee and I am with the Coast Guard. Glad to hear you made it to week 9! Ok, the suspended pendulum goes like this: Body position is lying down, prone so your toes are in the foot cradles similar to the suspended push-up. Begin the exercise by swinging your legs from right to left (feet together). Stabilize with your core so you are not swaying your entire body, just the lower body. Now, if you are going to add the pike, you "simply" hold the sway to one side in a pike position (tailbone into the air, body forming an inverted "V"). I usually do the exercise like this: Sway right, left, right and pike. Then, sway left, right, left and pike.
Does that make sense? I'm going to endeavor to take a picture of me doing this today so you can see it.