You can find this exercise on page 27 of the book Synergistic Golf.
Exercise Type: PILATES
Exercise Category: ABDOMINALS, BALANCE, POSTURE, STRENGTH
Lie on back with legs extended together on mat, toes pointed and arms overhead by ears. Inhale sliding scapulae down back reaching arms to ceiling, then roll up sequentially one vertebrae at a time. Focus on engaging the lower abdominal area which flexes hips and lifts legs off mat. Spine should be slightly rounded at top with arms reaching toward feet and legs in V position. Exhale roll down with control. Repeat movement 5x.