HOW: Bring your feet all the way together in a standing position. Bring your arms straight up overhead. Reach back as far as you can, safely, while following your fingers with your eyes creating an arch in your back. Your hips should move forward as you continue to reach back. Hold that stretch for as long as prescribed.
FEEL: You should feel a stretch in your core and back.
COMPENSATION: Make sure to continue to look at your hands to get the best extension.