Doing more crunches is not always the right answer. What kind of tummy do you have: pooch, tire, stress tummy? See which of the five you might have along with helpful hints to stop bad habits and flatten your belly!
Uttanasana is a great pose to help make hamstrings more flexible. Article: How Tight Hamstrings Affect Your Lumbar Spine. Research shows that stretching your hamstrings can help take the strain off the ligaments and disks of the lumbar spine.