hi guys
i also couln't understand the suggestion of abdominal strengthening exercises in Wikipedia reference-linkspondylolisthesis.crunches and lower limb cyclic movement will also recruit the hip flexers which has origin from lumbar vertebrae,so it will only worsen the listhesis.i think strengthening of transverse abdominis and multifidus only will help.i like to know your openions and suggestions.gud day