You can find this exercise on page 17 of the book Synergistic Golf.
Exercise Type: DYNAMIC STRETCH
Exercise Category: BACK, FLEXIBILITY, HIPS, SHOULDERS
Stand tall with feet together and arms overhead with elbows as close to ears as possible. Inhale to prepare. Exhale and allow arms to swipe down on either side of thighs or shins, then inhale stand back up with arms overhead. Focus on reaching and stretching up and down. Repeat 10x.