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1.There is a disk between the vertebral bodies, due to hard working nature, age related the disc gets loss of hydration and bulges - seen at different levels in your scan.
2.The
ligamentum flavum hypertrophy which is seen posterior to the
spinal cord.
3.There is a pressure effect on the spinal chord causing indentation on the
thecal sac.
4.The bulged disc seen causing pressure effect on the
nerve root / foramen.
5.In this case treatment includes exercises which gives good relief in your case, if not responding the next step will be
physiotherapy followed by the intervention in last stage, which will not be needed in your case.
6. Regular back exercises / yoga is good enough please try with out fail.
Good luck.
Hope i have answered your query,
any thing to ask ? do not hesitate to ask.
http://doctor.healthcaremagic.com/doctors/dr-ganesh/62888