Start: Lie sideways with the ball in the curve of your waist and your feet on the wall near the floor. Uppermost foot is forward. Place your uppermost hand on the side of your thigh and your other hand to the side of your head. Sink into a sideways curve over the ball.
Movement: Slide your uppermost hand straight down the side of your thigh, lifting your trunk into an upward curve. Lower yourself slowly back to the start position.
