You can find this exercise on page 62 of the book Synergistic Golf.
Exercise Type: HEAVY BALL
Exercise Category: ABDOMINALS, POSTURE, STRENGTH
Lie on floor with ball held to chest and toes flexed. Inhale lifting head to look toward feet. As you exhale roll one vertebrae at a time off floor reaching ball forward toward feet. Try not to use momentum. When sitting tall at the top, inhale as you roll back behind tailbone engaging abdominals. Exhale to finish roll down focusing on keeping abdominals tight and being in complete control of the roll down...fighting gravity. Complete 10 repetitions.