Why it helps: This move strengthens your core stabilizers, hips, shoulders, and back muscles, says Casella.
How to do it: Move the blocks to the side. Come forward onto your hands and knees. Draw your abdomen in toward your lower spine to support the center of your torso. Adjust your weight so you can reach one arm forward and the opposite leg back. Reach your inner thigh up toward the ceiling. Turn your palm to face the center line, and lift the thumb side of your hand toward the ceiling as you maintain the lift in your abdomen. Repeat several times on each side.