You can find this exercise on page 213 of the book Synergistic Golf.
Exercise Type: STRENGTH
Exercise Category: LOW BACK, POSTURE, STRENGTH
Similar to regular superman...Lie face down on floor with arms and lege straight out. Inhale. As you exhale lift right arm and left leg as high and as far away from your body as possible. Inhale, release and repeat with other side. Repeat each side 10x.