I am a fan of working my core with plank exercises. But the basic plank can get a little dull, so I asked Lauren, my Equinox trainer, to throw a new variation at me. She promptly introduced me to the two-point plank. Just holding this position is serious business, so adding arm and leg motion to the unstable plank takes the difficulty level up a notch. This exercise reminds me of the quadruped (a Read more