Walk the Plank This challenging sequence focuses on strength of core and upper body. Seeing if you can maintain body control with strengh while focusing the mind using breath and discipline is a tangible reality if you just practice using the correct muscles and technique. Modifying is the key to building from a strong foundation. Expect to be on your forearms alot in this one, plenty of planks and all of their variations mixed with a few down dogs and forward bends.