How (and Why) to Do Copenhagen Planks
by Beth Skwarecki from Lifehacker on (#63YRF)
We last saw Copenhagen planks in our rundown of the best bodyweight exercises that actually build strength. But it's an under-appreciated exercise, and deserves a spotlight of its own. The Copenhagen plank looks a bit like a side plank: You're leaning on your hand or elbow, other arm away from the ground, trying to...