You can find this exercise on page 284 of the book Synergistic Golf.
Exercise Type: PILATES
Exercise Category: ABDOMINALS, CLUB CONTROL - ACCURACY, FLEXIBILITY, STRENGTH
Lie on your back with legs extended straight and feet flexed hip distance apart. Hands are placed behind ears with elbows wide. Inhale, lengthening back of neck and dropping chin to look at feet lifting upper back off floor. Exhale and continue rolling spine off floor sequentially through while keeping upper spine flexed and rounded ending with face and chest aiming parallel with legs. Inhale return to sitting tall and spine straight. Exhale sliding shoulder blades down spine rolling spine back down to mat one vertebrae at a time to rest in starting position on floor. Focus on pulling abdominals into spine at all times. Complete 10 controlled repetitions.