Lie on your back with legs straight with soft knees, lower legs squeezing the sides of a stability ball.
Squeeze your legs against the ball and lift your pelvis off the ground.
Avoid arching through your lower back.
Slowly rotate your trunk and legs to one side and then to the other.
Ensure that your hips remain off the ground and your shoulders remain flat on the floor.
Repeat for the required number of repetitions then return to the starting position in a controlled manner.
