My son was receiving his physical to sign up for the US Navy and they stated that he had Spondylolisthesis. I have been researching this online to see what this is exactly. His back has never bothered him. I was wondering if anyone knows of excercises that he may be able to do to help him maybe strengthen his back to maybe help prevent future problems. Any suggestions for us to what type of doctor that we should see or anything useful for us. He is really wanting to join the Navy and this may keep him out.