Hollow

From Acrobalance

AKA Dish, Hollow Body

A good hollow position is crucial for many poses, including the handstand. A hollow position is the opposite of the arch position. In a hollow, your back is rounded but not contracted, your abdominal muscles are pulling in toward your spine, your ribs are 'in' toward your spine, and your legs are straight and together. A hollow the correct body positioning for a plank or a push-up exercise.