Lie down with your back on the mat and your legs in tabletop position, knees bent and shins parallel to the floor. Lift your head, neck, and shoulders and place your hands behind your ears, keeping your elbows wide.
Rotate your upper body to the left as you bend your left knee in toward your right elbow, while simultaneously extending your right leg long.
Keep your head, neck, and shoulders lifted as you bring your upper body back to the center and extend your left leg, then rotate to the right as you bend your right knee in toward your left elbow.
Continue alternating sides, either going slow or fast.