The Key to a good stretch is Relaxing the Deep Muscles of the Spine to bring the Muscles to full extension which in turn allows the Connective Tissue to Decompress. When the body is Fully Relaxed the Pelvis Drops Naturally into Suspended Neutral Posture.
The ability to Fully Relax the Spine varies with the Individual, for some it may require practice over a few days to truly "Let Go" with the intuitive tense or anxious deep muscles. Don't rush it, go slowly, you're in control. Total suspension isn't necessary to get a good stretch. You should feel at ease and relaxed as the muscles reach full extension. If you feel pain, stop, consult your health care professional as this may indicate pre-existing torn or stressed tissue.
Relax, Let Go, Drop Your Pelvis