Lie sideways with the ball underneath your waist.
Your feet should be at floor level, up against a wall with one foot in front of the other.
Place your arms across your chest and hold your body in a straight line so that it is diagonal to the floor.
Lower you your upper body down towards the ball by bending in a sideways motion.
Lift all the way up, and then control the movement back down, repeating the exercise.
