You can find this exercise on page 223 of the book Synergistic Golf.
Exercise Type: HEAVY BALL
Exercise Category: ABDOMINALS, LEGS - FEET, POWER PRODUCTION, RHYTHM - TIMING, STRENGTH
Stand with feet slightly wider than hips with ball in hands reaching up toward the right. Lower the ball diagonally across the front of body and touch ball to floor on the outside of the left foot. Bending should occur in ankles, knees, and hips vs. just back. Return back up to reaching over right shoulder. Repeat 10x same side then switch sides. Keep good form. Action imitates picking object off floor on one side and putting up onto shelf on opposite side.