Spine Stretch Forward and Spine Stretch Side can be deceivingly challenging. The hardest part may be getting into the starting position for those of you with tight hamstrings.
It is more important to start with a straight spine than straight legs. Feel free to prop up your pelvis or bend your knees to achieve this starting position.
This is a stretch for the spine, not the hamstrings. By bending the knees and/or elevating the pelvis, you can take the hamstrings out of the equation and concentrate on the spine.