Lie flat on the floor with your hands behind your head and elbows out wide.
Pull your belly button into your spine as you lift your legs a few inches off the floor, and slowly raise your shoulders and neck off the ground without pulling with your hands.
Leading with your left elbow, twist your torso to the right side as you bring your right knee in. Keep your left leg out long.
Return your arm and leg back to center, and twist your torso to the left side as you bring your right knee in, leading with your right elbow and keeping your right leg out long.
This completes one rep. Keep alternating from side to side for 30 seconds.