You can find this exercise on page 305 of the book Synergistic Golf.
Exercise Type: YOGA-STRETCH
Exercise Category: CHEST, FLEXIBILITY, HIPS
Kneel on all fours similar to cat-cow pose. Inhale pulling belly button into spine and sit back onto heels. Keep palms on floor and allow head to fall between elbows. Exhale and bring body back up to kneeling position. Repeat 10x.