You can find this exercise on page 309 of the book Synergistic Golf.
Exercise Type: BIG BALL
Exercise Category: HIPS, LOW BACK, SHOULDERS, STRENGTH
Stand tall with feet slightly wider than hip distance apart. Hold ball directly in front of chest with straight arms. Inhale and reach ball to top left corner over shoulder slightly raising up on right toe. Exhale pulling ball down toward right ankle. Legs will bend into a slight lunge lifting left heel off floor. Focus on good form and rhythm. Repeat 10x on one side, Then switch to other side.