Stand with legs hip-width apart, knees slightly bent. Holding ends of a rolled-up towel, extend arms overhead in a V formation.
Lift up and out of your rib cage and reach about 10 degrees to the left without moving your lower body. Return to start. Bend to opposite side to complete one rep.
Concentrate on bending from the waist, and letting your upper body/arms follow.
Muscles Worked: Obliques