Using a towel in this exercise can help create resistance, support movement, and is great for mobilizing the joints, says Moira Merrithew, star of the Stott Pilates: Pilates Towel Workout for Strength & Mobility DVD.
How to do it: Lie faceup on a mat with your spine in a neutral position, knees bent, one ankle crossed over the other knee. Loop the towel behind your raised knee, holding both ends in same hand, other hand behind head. Contract your abdominal muscles and bicep holding the towel as you raise your torso and elbow, rotating toward the towel side. Try up to 3 sets of 8-10 reps.