The Side Stretch and Swirl exercise works your back, abs, obliques, and inner thighs.
Side stretch and Swirl - You're gonna start with letting the hip go, reaching all the way to the sides and coming horizontal with the floor. You're gonna do flat back and swirl over to the side. Come back into that deep side stretch and come all the way up. Then, you're gonna return to the same side you just ended on back into the swirl to the other sides, come back into your side stretch and up.