Sit upright on a stability ball.
Place your feet flat on the floor with your knees and hips bent to 90 degrees.
Gently tighten your tummy muscle and pull your shoulder blades back and down.
Tilt your pelvis forwards arching your back and sticking your tail bone out behind you.
Slump down, rolling your tail bone underneath and rounding your back.
Keep your shoulders and upper back still during the movement.
